Let us not underrate the value of a fact; it will one day flower in a truth.

Declining from the public ways, walk in unfrequented paths.

...so it is with human reason, which strives not against faith, when enlightened, but rather furthers and advances it.

Of the twenty or so civilizations known to modern Western historians, all except our own appear to be dead or moribund, and, when we diagnose each case, in extremis or post mortem, we invariably find that the cause of death has been either War or Class or some combination of the two. To date, these two plagues have been deadly enough, in partnership, to kill off nineteen out of twenty representatives of this recently evolved species of human society; but, up to now, the deadliness of these scourges has had a saving limit.

We do not live for idle amusement. I would not run round a corner to see the world blow up.

You are in the same manner surrounded with a small circle of persons... full of desire. They demand of you the benefits of desire... You are therefore properly the king of desire. ...equal in this to the greatest kings of the earth... It is desire that constitutes their power; that is, the possession of things that men covet.

In the old dramas it was love that had to be sacrificed to painful duty. In the modern instance the sacrifice is at the shrine of what William James called "the Bitch Goddess, Success." Love is to be abandoned for the stern pursuit of newspaper notoriety and dollars.

He who does wrong is more unhappy than he who suffers wrong.

If we are going to be destroyed by an atomic bomb, let that bomb when it comes find us doing sensible and human things - praying, working, teaching, reading, listening to music, bathing the children, playing tennis, chatting to our friends over a pint and a game of darts - not huddled together like frightened sheep and thinking about bombs. They might break our bodies (a microbe can do that) but they need not dominate our minds.

It is arrogance in us to call frankness, fairness and chivalry "masculine" when we see them in a woman; it is arrogance in them, to describe a man's sensitiveness or tact or tenderness as "feminine".

The best people renounce all for one goal, the eternal fame of mortals; but most people stuff themselves like cattle. For what sense or understanding have they? They follow minstrels and take the multitude for a teacher, not knowing that many are bad and few good. For the best men choose one thing above all immortal glory among mortals; but the masses stuff themselves like cattle.

A book can never be anything more than the impression of its author's thoughts [Ein Buch kann nie mehr seyn, als der Abdruck der Gedanken des Verfassers]. The value of these thoughts lies either in the matter about which he has thought, or in the form in which he develops his matter - that is to say, what he has thought about it.

All the world knows me in my book, and my book in me.

What should we gain by a definition, as it can only lead us to other undefined terms?

Not much younger than these (sc. Hermotimus of Colophon and Philippus of Mende) is Euclid, who put together the Elements, collecting many of Eudoxus' theorems, perfecting many of Theaetetus', and also bringing to irrefragable demonstration the things which were only somewhat loosely proved by his predecessors. This man lived in the time of the first Ptolemy. For Archimedes, who came immediately after the first (Ptolemy), makes mention of Euclid: and, further, they say that Ptolemy once asked him if there was in geometry any shorter way than that of the elements, and he answered that there was no royal road to geometry. He is then younger than pupils of Plato but older than Eratosthenes and Archimedes; for the latter were contemporary with one another, as Eratosthenes somewhere says.

It's not worth the bother of killing yourself, since you always kill yourself too late.

Ideas are refined and multiplied in the commerce of minds. In their splendor, images effect a very simple communion of souls.

In doing good, we are generally cold, and languid, and sluggish; and of all things afraid of being too much in the right. But the works of malice and injustice are quite in another style. They are finished with a bold, masterly hand; touched as they are with the spirit of those vehement passions that call forth all our energies, whenever we oppress and persecute.

Now he saw the problem with great clarity. If he lived here, life would be pleasant and safe. But it would also be predictable. A child could be born here, grow up here, die here, without ever experiencing the excitement of discovery. Why did Dona question him endlessly about his life in the burrow and his journey to the country of the ants? Because for her, it represented a world that was dangerous and full of fascinating possibilities. For the children of this underground city, life was a matter of repetition, of habit. And this, he suddenly realized, was the heart of the problem. Habit. Habit was a stifling, warm blanket that threatened you with suffocation and lulled the mind into a state of perpetual nagging dissatisfaction. Habit meant the inability to escape from yourself, to change and develop . . .

I don't feel that it is necessary to know exactly what I am. The main interest in life and work is to become someone else that you were not in the beginning. If you knew when you began a book what you would say at the end, do you think that you would have the courage to write it? What is true for writing and for a love relationship is true also for life. The game is worthwhile insofar as we don't know what will be the end. My field is the history of thought. Man is a thinking being.

Among a people without fellow-feeling, especially if they read and speak different languages, the united public opinion, necessary to the working of the representative government, cannot exist.

So far as it has gone, it probably is the most pure and defecated publick good which ever has been conferred on mankind.

What strikes one here above all is the crudely empirical conception of profit derived from the outlook of the ordinary capitalist, which wholly contradicts the better esoteric understanding of Adam Smith.

The reservedness and distance that fathers keep, often deprive their sons of that refuge which would be of more advantage to them than an hundred rebukes or chidings.

I am a rationalist. ...I mean ...[I] wish... to understand the world, and to learn by arguing with others. (...I do not say a rationalist holds the mistaken theory that men are... rational.)

Respectable scientists like de Broglie himself accept wave mechanics because it confers coherence and unity upon the experimental findings of contemporary science, and in spite of the astonishing changes it implies in connection with ideas of causality, time, and space, but it is because of these changes that it wins favor with the public. The great popular success of Einstein was the same thing. The public drinks in and swallows eagerly everything that tends to dispossess the intelligence in favor of some technique; it can hardly wait to abdicate from intelligence and reason and from everything that makes man responsible for his destiny.

If each us had a different kind of sense perception — if we could only perceive things now as a bird, now as a worm, now as a plant, or if one of us saw a stimulus as red, another as blue, while a third even heard the same stimulus as a sound, then no one would speak of such a regularity of nature, rather, nature would be grasped only as a creation which is subjective in the highest degree. After all, what is a law of nature as such for us? We are not acquainted with it in itself, but only with its effects, which means in its relation to other laws of nature which, in turn, are known to us only as sums of relations. Therefore all these relations always refer again to others and are thoroughly incomprehensible to us in their essence.

One of the ideas I had discussed in The Poverty of Historicism was the influence of a prediction upon the event predicted. I had called this the "Oedipus effect", because the oracle played a most important role in the sequence of events which led to the fulfilment of its prophecy. ... For a time I thought that the existence of the Oedipus effect distinguished the social from the natural sciences. But in biology, too-even in molecular biology-expectations often play a role in bringing about what has been expected.

Falsehood and delusion are allowed in no case whatever: But, as in the exercise of all the virtues, there is an œconomy of truth. It is a sort of temperance, by which a man speaks truth with measure that he may speak it the longer.

It is false that kings are entitled to the eminence they obtain. They possess no intrinsic superiority over their subjects. The line of distinction that is drawn is the offspring of pretense, an indirect means employed for effecting certain purposes, and not the language of truth. It tramples upon the genuine nature of things, and depends for its support upon this argument, 'that, were it not for impositions of a similar nature, mankind would be miserable.'

People will tell us that without the consolations of religion they would be intolerably unhappy. So far as this is true, it is a coward's argument. Nobody but a coward would consciously choose to live in a fool's paradise. When a man suspects his wife of infidelity, he is not thought the better of for shutting his eyes to the evidence. And I cannot see why ignoring evidence should be contemptible in one case and admirable in the other.

A terrible thing is intelligence. It tends to death as memory tends to stability. The living, the absolutely unstable, the absolutely individual, is strictly unintelligible. Logic tends to reduce everything to identities and genera, to each representation having no more than one self-same content in whatever place, time or relation it may occur to us. And there is nothing that remains for two successive moments of its existence. My idea of God is different each time that I conceive it. Identity, which is death, is the goal of the intellect. The mind seeks what is dead, for what is living escapes it; it seeks to congeal the flowing stream in blocks of ice; it seeks to arrest it. In order to analyze a body it is necessary to extenuate or destroy it. In order to understand anything it is necessary to kill it, to lay it out rigid in the mind.

It seems that sin is geographical. From this conclusion, it is only a small step to the further conclusion that the notion of "sin" is illusory, and that the cruelty habitually practised in punishing it is unnecessary.

Good and evil, reward and punishment, are the only motives to a rational creature: these are the spur and reins whereby all mankind are set on work, and guided.

Cautiousness in judgment is nowadays to be recommended to each and every one: if we gained only one incontestable truth every ten years from each of our philosophical writers the harvest we reaped would be sufficient. ... To grow wiser means to learn to know better and better the faults to which this instrument with which we feel and judge can be subject.

Ah! why do women condescend to receive a degree of attention and respect from strangers different from that reciprocation of civility which the dictates of humanity and the politeness of civilization authorize between man and man? And why do they not discover, when, "in the noon of beauty's power", that they are treated like queens only to be deluded by hollow respect. Confined, then, in cages like the feathered race, they have nothing to do but to plume themselves, and stalk with mock majesty from perch to perch.

Most people live, whether physically, intellectually or morally, in a very restricted circle of their potential being. They make use of a very small portion of their possible consciousness, and of their soul's resources in general, much like a man who, out of his whole bodily organism, should get into a habit of using and moving only his little finger. Great emergencies and crises show us how much greater our vital resources are than we had supposed.

And Jesus answered and said unto her, Martha, Martha, thou art careful and troubled about many things, but one thing is needful: and Mary hath chosen that good part, which shall not be taken away from her.

First of all, principles should be general. That is, it must be possible to formulate them without use of what would be intuitively recognized as proper names, or rigged definite descriptions.

The commonest and cheapest sounds, as the barking of a dog, produce the same effect on fresh and healthy ears that the rarest music does. It depends on your appetite for sound. Just as a crust is sweeter to a healthy appetite than confectionery to a pampered or diseased one.

The third of this kind of principles is : matter neither originates nor perishes; all the changes in the world concern form only ; a postulate which on the recommendation of common sense has spread through all philosophical schools, not because it is to be taken as having been found so, or as having been demonstrated by arguments a priori, but because if we were to admit that matter itself is fleeting and transitory, nothing at all that is stable and lasting would be left any longer to serve for the explication of phenomena according to universal and perpetual laws, and hence nothing at all would be left for the exercise of the intellect.

Man has ever expressed some symbolical Philosophy of his Being in his Works and Conduct; he announces himself and his Gospel of Nature; he is the Messiah of Nature.

Have ye not read what David did, when he was an hungred, and they that were with him; How he entered into the house of God, and did eat the shewbread, which was not lawful for him to eat, neither for them which were with him, but only for the priests? Or have ye not read in the law, how that on the sabbath days the priests in the temple profane the sabbath, and are blameless? But I say unto you, That in this place is one greater than the temple. But if ye had known what this meaneth, I will have mercy, and not sacrifice, ye would not have condemned the guiltless.

The animals are much more content with mere existence than we are; the plants are wholly so; and man is so according to how dull and insensitive he is. The animal's life consequently contains less suffering but also less pleasure than the human's, the direct reason being that on the one hand it is free from care and anxiety and the torments that attend them, but on the other is without hope and therefore has no share in that anticipation of a happy future which, together with the enchanting products of the imagination which accompany it, is the source of most of our greatest joys and pleasures. The animal lacks both anxiety and hope because its consciousness is restricted to what is clearly evident and thus to the present moment: the animal is the present incarnate.

Driving is a spectacular form of amnesia. Everything is to be discovered, everything to be obliterated. Admittedly, there is the primal shock of the deserts and the dazzle of California, but when this is gone, the secondary brilliance of the journey begins, that of the excessive, pitiless distance, the infinity of anonymous faces and distances, or of certain miraculous geological formations, which ultimately testify to no human will, while keeping intact an image of upheaval. This form of travel admits of no exceptions: when it runs up against a known face, a familiar landscape, or some decipherable message, the spell is broken: the amnesic, ascetic, asymptotic charm of disappearance succumbs to affect and worldly semiology.

Ten thousand do not turn the scale against a single man of worth.

Your Constitution is all sail and no anchor.

Eternity, not as a static "now," nor as a sequence of "nows" rolling off into the infinite, but as the "now" that bends back into itself. ... Thinking the most difficult thought of philosophy means thinking being as time.