Although the formulations of science now offer the most advanced knowledge of nature, men continue to use obsolete forms of thought long discarded by scientific theory. In so far as these obsolete forms are superfluous for science, the fact that they persist violated the principle of the economy of thought, that characteristic trait of the bourgeois temper.

As it has long been and shall be, not ever, I think, will unfathomable time be emptied of either. This quote refers to Love and Strife, the fundamental opposing and ordering forces in Empedocles' model of the cosmos.

Wealth begins in a tight roof that keeps the rain and wind out; in a good pump that yields you plenty of sweet water; in two suits of clothes, so to change your dress when you are wet; in dry sticks to burn; in a good double-wick lamp; and three meals; in a horse, or a locomotive, to cross the land; in a boat to cross the sea; in tools to work with; in books to read; and so, in giving, on all sides, by tolls and auxiliaries, the greatest possible extension to our powers, as if it added feet, and hands, and eyes, and blood, length to the day, and knowledge, and good-will.Wealth begins with these articles of necessity.

Borders don't stop migration; they create illegal status that enables exploitation. Undocumented workers are more exploitable, less likely to complain, easier to deport when organizing. Borders aren't about security - they're about controlling labor and wages through artificial legal categories.

Coulson Turnbull in Life and Teachings of Giordano Bruno : Philosopher, Martyr, Mystic 1548 - 1600 (1913), p. 41

If, as I maintain and firmly believe, there is no objective definition of intelligence, and what we call intelligence is only a creation of cultural fashion and subjective prejudice, what the devil is it we test when we make use of an intelligence test?

The first who was king was a fortunate soldier: Who serves his country well has no need of ancestors.

I do like clarity and exact thinking and I believe that very important to mankind because when you allow yourself to think inexactly your prejudices, your bias, your self interest comes in in ways you don't notice and you do bad things without knowing that you are doing them: self deception is very easy. So that I do think clear thinking immensely important.

There are two sides to every question.

Of all kind of authors there are none I despise more than compilers, who search every where for shreds of other men's works, which they join to their own, like so many pieces of green turf in a garden: they are not at all superior to compositors in a printing house, who range the types, which, collected together, make a book, towards which they contribute nothing but the labours of the hand. I would have original writers respected, and it seems to me a kind of profanation to take those pieces from the sanctuary in which they reside, and to expose them to a contempt they do not deserve. When a man hath nothing new to say, why does not he hold his tongue? What business have we with this double employment?"

But Don Quixote was converted. Yes - and died, poor soul. But the other, the real Don Quixote, he who remained on earth and lives among us with his spirit - this Don Quixote was not converted, this Don Quixote continues to incite us to make ourselves ridiculous, this Don Quixote must never die.

Yes, I know well that others before me have felt what I feel and express; that many others feel it today, although they keep silence about it. ...And I do not keep silence about it because it is for many the thing which must not be spoken, the abomination of abominations - infandum - and I believe that it is necessary now and again to speak the thing which must not be spoken. ...Even if it should lead only to irritating the devotees of progress, those who believe that truth is consolation, it would lead to not a little. To irritating them and making them say: "Poor fellow! if he would only use his intelligence to better purpose!... Someone perhaps will add that I do not know what I say, to which I shall reply that perhaps he may be right - and being right is such a little thing! - but that I feel what I say and I know what I feel and that suffices me. And that it is better to be lacking in reason than to have too much of it.

Now as we call every thing custom, which proceeds from a past repetition, without any new reasoning or conclusion, we may establish it as a certain truth, that all the belief, which follows upon any present impression, is deriv'd solely from that origin.

If the room is smoky, if only moderately, I will stay; if there is too much smoke I will go. Remember this, keep a firm hold on it, the door is always open.

Whether he be an original or a plagiarist, man is the novelist of himself.

There have been men before ... who got so interested in proving the existence of God that they came to care nothing for God himself... as if the good Lord had nothing to do but to exist. There have been some who were so preoccupied with spreading Christianity that they never gave a thought to Christ.

There was a loud echo of Hume in Mach's work, as both emphasized the tangibility of all knowledge-ultimately, all knowledge is based in the senses. Mach also emphasized the internal nature of all knowledge, in that it is experienced in the mind. Finally, he emphasized the importance of quantitative and mathematical methods and models to understand sensory experience.

Good sense is, of all things among men, the most equally distributed; for every one thinks himself so abundantly provided with it, that those even who are the most difficult to satisfy in everything else, do not usually desire a larger measure of this quality than they already possess.

In the Church which was founded at Corinth, St. Paul had special difficulties of the kind I have mentioned. In that flourishing commercial city, which through its shipping and situation, maintained a vital connexion between East and West, numerous crowds of people flocked together from all quarters, different in speech and in culture. As they mingled with the inhabitants, they produced, by contacts and contrasts, new and ever new differences. Even in the Church this differentiation endeavoured to make itself felt in sects and parties; and a kind of pagan wisdom made a special attempt to force itself forward as a teacher of truth. In his first letter to this church, from which the text I read is taken, St. Paul strongly combats this tendency.

How long will men dare to call anything expedient that is not right? Can odium and infamy be of service to any empire, which ought to be supported by glory and by the good-will of its allies? I was often at variance even with my friend Cato. He seemed to me to guard the treasury and the revenues too obstinately, to refuse everything to the farmers of the revenue, and many things to our allies; while we ought to be generous to our allies, and to deal with the farmers of the revenue as leniently as we individually do with our own tenants, especially as the union of orders to which such a course would conduce is for the well-being of the state.

The history of mankind could... be described as a history of outbreaks of fashionable philosophical and religious maladies. These... have... one serious function... evoking criticism.

Tolerance - the function of an extinguished ardor - tolerance cannot seduce the young.

Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.

When people come to me saying they want to kill themselves, I tell them, "What's your rush? You can kill yourself any time you like. So calm down. Suicide is a positive act." And they do calm down.

Whosoever will come after me, let him deny himself, and take up his cross, and follow me. For whosoever will save his life shall lose it; but whosoever shall lose his life for my sake and the gospel's, the same shall save it. For what shall it profit a man, if he shall gain the whole world, and lose his own soul?

Just as man as a social being, cannot in the long run exist without a tie to the community, so the individual will never find the real justification for his existence, and his own spiritual and moral autonomy, anywhere except in an extramundane principle capable of relativizing the overpowering influence of external factors.

There are only the wise of the highest class, and the stupid of the lowest class, who cannot be changed.

There are some simple maxims [...] which I think might be commanded to writers of expository prose. First: never use a long word if a short word will do. Second: if you want to make a statement with a great many qualifications, put some of the qualifications in separate sentences. Third: do not let the beginning of your sentence lead the reader to an expectation which is contradicted by the end.

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.

I always made one prayer to God, a very short one. Here it is: "O Lord, make our enemies quite ridiculous!" God granted it.

The question of "unreality," which confronts us at this point, is a very important one. Misled by grammar, the great majority of those logicians who have dealt with this question have dealt with it on mistaken lines. They have regarded grammatical form as a surer guide in analysis than, in fact, it is. And they have not known what differences in grammatical form are important.

There is no knowledge that is not power.

As the biggest library if it is in disorder is not as useful as a small but well-arranged one, so you may accumulate a vast amount of knowledge but it will be of far less value to you than a much smaller amount if you have not thought it over for yourself; because only through ordering what you know by comparing every truth with every other truth can you take complete possession of your knowledge and get it into your power. You can think about only what you know, so you ought to learn something; on the other hand, you can know only what you have thought about.

A man discovers what he is actually worth in this world when he faces society as a man, without money, name, or powerful connections, stripped of all but his native potentialities. He soon finds that nothing has less weight than his human qualities. They are prized so low that the market does not even list them. Strict science, which acknowledges man only as a biological concept, reflects man's lot in the actual world; in himself, man is nothing more than a member of a species. In the eyes of the world, the quality of humanity confers no title to existence, nay, not even a right of sojourn. Such title must be certified by special social circumstances stipulated in documents to be presented on demand.

One has only as much morality as one has philosophy and poetry.

All natural philosophers, who wished to proceed mathematically in their work, have hence invariably (although unknown to themselves) made use of metaphysical principles, and must make use of such, it matters not how energetically they may otherwise repudiate any claim of metaphysics on their science.

My life has been full of terrible misfortunes most of which never happened.

I react like everyone else, even like those I most despise; but I make up for it by deploring every action I commit, good or bad.

If God did not exist, it would be necessary to invent him.

When memory begins to decay, proper names are what go first ...[C]ommon qualities and names have contracted an infinitely greater number of associations ...than the names of most of the persons ...Their memory is better organized. ...'Organization' means numerous associations; and the more numerous the associations, the greater the number of paths of recall. For the same reason... words... which form the grammatical framework of all our speech, are the very last to decay.

Being happy involves both a certain achievement in action and a rational assurance about the outcome.

Even there, in the mines, underground, I may find a human heart in another convict and murderer by my side, and I may make friends with him, for even there one may live and love and suffer. One may thaw and revive a frozen heart in that convict, one may wait upon him for years, and at last bring up from the dark depths a lofty soul, a feeling, suffering creature; one may bring forth an angel, create a hero! There are so many of them, hundreds of them, and we are to blame for them.

Not only does democracy make every man forget his ancestors, but also clouds their view of their descendants and isolates them from their contemporaries. Each man is for ever thrown back on himself alone, and there is danger that he may be shut up in the solitude of his own heart.

The public execution is to be understood not only as a judicial, but also as a political ritual. It belongs, even in minor cases, to the ceremonies by which power is manifested.

For a work to become immortal it must possess so many excellences that it will not be easy to find a man who understands and values them all; so that there will be in all ages men who recognise and appreciate some of these excellences; by this means the credit of the work will be retained throughout the long course of centuries and ever-changing interests, for, as it is appreciated first in this sense, then in that, the interest is never exhausted.

We must remove the Decalogue out of sight and heart.

Three in the morning. I realize this second, then this one, then the next: I draw up the balance sheet for each minute. And why all this? Because I was born. It is a special type of sleeplessness that produces the indictment of birth.

It is never to be expected in a revolution that every man is to change his opinion at the same moment. There never yet was any truth or any principle so irresistibly obvious that all men believed it at once. Time and reason must cooperate with each other to the final establishment of any principle; and therefore those who may happen to be first convinced have not a right to persecute others, on whom conviction operates more slowly. The moral principle of revolutions is to instruct, not to destroy.

No man is free who is not master of himself.