Practice no sloth, so that the duty and good work, which it is necessary for thee to do, may not remain undone.

That you may know that they whom anger possesses are not sane, look at their appearance; for as there are distinct symptoms which mark madmen, such as a bold and menacing air, a gloomy brow, a stern face

Let us apply these principles to adultery. The state can no more prohibit it or punish it by law than any other illegitimate satisfaction of the sexual impulse.

It has always been the task of formal education to set up behavior which would prove useful or enjoyable later in a student's life.

There are two ways of extending life: firstly by moving the two points "born" and "died" farther away from one another... The other method is to go more slowly and leave the two points wherever God wills they should be, and this method is for the philosophers.

Yes! We believe in a higher principle than your virtue and the kind of morality you speak of so paltrily and without much conviction. We believe that there is no imperative or reward for virtue for the soul because it simply acts according to the necessity of its inherent nature. The moral imperative expresses itself in an ought and presupposes the concept of an evil next to that of good.

Some minds will jump here jump to the conclusion that a past idea cannot in any sense be present. But that is hasty and illogical. How extravagant too, to pronounce our whole knowledge of the past to be mere delusion! Yet it would seem that the past is completely beyond the bounds of possible experience as a Kantian thing-in-itself.

Let thy mind rule thy tongue!

Gottlob Frege created modern logic including "for all," "there exists," and rules of proof. Leibniz and Boole had dealt only with what we now call "propositional logic" (that is, no "for all" or "there exists"). They also did not concern themselves with rules of proof, since their aim was to reach truth by pure calculation with symbols for the propositions. Frege took the opposite track: instead of trying to reduce logic to calculation, he tried to reduce mathematics to logic, including the concept of number.

Virtue can only flourish amongst equals.

One of the most difficult tasks men can perform, however much others may despise it, is the invention of good games and it cannot be done by men out of touch with their instinctive selves.

A son is a mirror in which the father sees himself reflected, and the father is a mirror in which the son sees himself as he will be in the future.

Would you not think him an utter fool who wept because he was not alive a thousand years ago? And is he not just as much of a fool who weeps because he will not be alive a thousand years from now? It is all the same; you will not be, and you were not. Neither of these periods of time belongs to you.

Nietzsche, driven by the absolute demand of his existential truthfulness, could not abide the bourgeois world, even when its representative had human nobility.

That which is best about conservatism, that which, though it cannot be expressed in detail, inspires reverence in all, is the Inevitable.

I know that a Christian should be humble, but against the Pope I am going to be proud and say to him: "You, Pope, I will not have you for my boss, for I am sure that my doctrine is divine."

Where the world comes in my way - and it comes in my way everywhere - I consume it to quiet the hunger of my egoism. For me you are nothing but - my food, even as I too am fed upon and turned to use by you. We have only one relation to each other, that of usableness, of utility, of use.

Only the feeble resign themselves to final death and substitute some other desire for the longing for personal immortality. In the strong the zeal for perpetuity overrides the doubt of realizing it, and their superabundance of life overflows upon the other side of death.

The foundation of all technology is fire.

It is clearly absurd to say that if you go on adding atoms together until they have fused into a complex molecule, that molecule will become capable of self-reproduction. It is like saying that a skyscraper is more capable of reproduction than a bungalow. And suppose life did come into being through some accidental interaction of molecules, sun and cosmic rays; why should it not be content to rest passively? Why should it have been possessed of a desire to persist and evolve?

If you could be alarmed into the semblance of modesty, you would charm everybody; but remember my joke against you about the Moon and the Solar System;-"Damn the solar system! bad light - planets too distant - pestered with comets - feeble contriviance; - could make a better with great ease."

Noise is the most impertinent of all forms of interruption. It is not only an interruption, but also a disruption of thought.

Whenever a system of communication evolves, there is always the danger that some will exploit the system for their own ends.

Is it surprising that prisons resemble factories, schools, barracks, hospitals, which all resemble prisons?

If anything is certain, it is that I myself am not a Marxist

To the Deity must be left the task of infinite perfection, while to us poor, weak, incapable mortals, there was no rule of conduct so safe as experience.

It is quite clear to you that all the people see that lower kinds of creation could have been made in a different way from that in which they really are, and as they see this lower degree in many things they think that they must have been made by chance.

Nature, which alone is good, is wholly familiar and common.

Gradually the village murmur subsided, and we seemed to be embarked on the placid current of our dreams, floating from past to future as silently as one awakes to fresh morning or evening thoughts.

Optimism is an alienated form of faith, pessimism an alienated form of despair. If one truly responds to man and his future, ie, concernedly and "responsibly." one can respond only by faith or by despair. Rational faith as well as rational despair are based on the most thorough, critical knowledge of all the factors that are relevant for the survival of man.

Is the position tenable, that certain phenomena, possible in Euclidean space, would be impossible in non-Euclidean space, so that experience, in establishing these phenomena, would directly contradict the non-Euclidean hypothesis? For my part I think no such question can be put. To my mind it is precisely equivalent to the following, whose absurdity is patent to all eyes: are there lengths expressible in meters and centimeters, but which can not be measured in fathoms, feet, and inches, so that experience, in ascertaining the existence of these lengths, would directly contradict the hypothesis that there are fathoms divided into six feet?

In my fiction I am careful to make everything probable and to tie up all loose ends. Real life is not hampered by such considerations.

What an incalculable debt do we owe to that little speck of land, Greece.-The principles of taste, the finest models of composition, the doctrines and the glorious examples to which we owe political freedom, the arts, the sciences, architecture, sculpture, every thing that is great and splendid in literature and politics, must be considered as ultimately derived from that little peninsula.

He wins every hand who mingles profit with pleasure, by delighting and instructing the reader at the same time.

The student should have enough knowledge of his or her cultural tradition to know how it got to be the way it is. This involves both political and social history, on the one hand, as well as the mastery of some of the great philosophical and literary texts of the culture on the other. It involves reading not only texts that are of great value, like those of Plato, but many less valuable that have been influential, such as the works of Marx. For the United States, the dominant tradition is, and for the foreseeable future, will remain the European tradition. The United States is, after all, a product of the European Enlightenment. However, you do not understand your own tradition if you do not see it in relation to others. Works from other cultural traditions need to be studied as well.

In whatever state of knowledge we may conceive man to be placed, his progress towards a yet higher state need never fear a check, but must continue till the last existence of society.

As the Genesis story teaches, knowledge cannot save us from ourselves. If we know more than before, it means only that we have greater scope to enact our fantasies. But - as the Genesis myth also teaches - there is no way we can rid ourselves of what we know. If we try to regain a state of innocence, the result can only be a worse madness. The message of Genesis is that in the most vital areas of human life there can be no progress, only an unending struggle with our own nature.

To live without duties is obscene.

Fate is not in man but around him.

Let no man be ashamed to speak what he is not ashamed to think.

Originally, ethics has no existence apart from religion, which holds it in solution.

I suddenly dreamt that I picked up the revolver and aimed it straight at my heart - my heart, and not my head; and I had determined beforehand to fire at my head, at my right temple. After aiming at my chest I waited a second or two, and suddenly my candle, my table, and the wall in front of me began moving and heaving. I made haste to pull the trigger.

That I, a funny little gesticulating animal on two legs, should stand beneath the stars and declaim in a passion about my rights - it seems so laughable, so out of all proportion. Much better, like Archimedes, to be killed because of absorption in eternal things... There is a possibility in human minds of something mysterious as the night-wind, deep as the sea, calm as the stars, and strong as Death, a mystic contemplation, the "intellectual love of God." Those who have known it cannot believe in wars any longer, or in any kind of hot struggle. If I could give to others what has come to me in this way, I could make them too feel the futility of fighting. But I do not know how to communicate it: when I speak, they stare, applaud, or smile, but do not understand.

You ask me why I do not write something... I think one's feelings waste themselves in words; they ought all to be distilled into actions and into actions which bring results.

Such then is the human condition, that to wish greatness for one's country is to wish harm to one's neighbors.

No matter that we may mount on stilts, we still must walk on our own legs. And on the highest throne in the world, we still sit only on our own bottom.

The horseman serves the horse, The neatherd serves the neat, The merchant serves the purse, The eater serves his meat; 'Tis the day of the chattel, Web to weave, and corn to grind; Things are in the saddle, And ride mankind.

I came into this world, not chiefly to make this a good place to live in, but to live in it, be it good or bad.