To my complete surprise, that exposure to out-of-date scientific theory and practice radically undermined some of my basic conceptions about the nature of science and the reasons for its special success.Those conceptions were ones I had previously drawn partly from scientific training itself and partly from a long-standing avocational interest in the philosophy of science. Somehow, whatever their pedagogic utility and their abstract plausibility, those notions did not at all fit the enterprise that historical study displayed. Yet they were and are fundamental to many discussions of science, and their failures of verisimilitude therefore seemed thoroughly worth pursuing. The result was a drastic shift in my career plans, a shift from physics to history of science and then, gradually, from relatively straightforward historical problems back to the more philosophical concerns that had initially led me to history.

Any physical object which by its influence deteriorates its environment, commits suicide.

Thou shouldst not become presumptuous through great connections and race; for in the end thy trust is on thine own deeds.

Economic man deals with the "real world" in all its complexity. Administrative man recognizes that the world he perceives is a drastic simplified model... He makes his choices using a simple picture of the situation that takes into account just a few of the factors that he regards as most relevant and crucial.

Some men look at constitutions with sanctimonious reverence and deem them like the ark of the covenant, too sacred to be touched. They ascribe to the men of the preceding age a wisdom more than human and suppose what they did to be beyond amendment. I knew that age well; I belonged to it and labored with it. It deserved well of its country. It was very like the present but without the experience of the present; and forty years of experience in government is worth a century of book-reading; and this they would say themselves were they to rise from the dead.

A man is a god in ruins.

Attention spans get very weak at the speed of light, and that goes along with a very weak identity.

We must admit, however, that neither wild beasts nor any other creature except man is subject to anger: for, whilst anger is the foe of reason, it nevertheless does not arise in any place where reason cannot dwell. Wild beasts have impulses, fury, cruelty, combativeness: they have not anger any more than they have luxury: yet they indulge in some pleasures with less self-control than human beings.

Dead of night. No one, nothing but the society of the moments. Each pretends to keep us company, then escapes - desertion after desertion.

The For-itself, in fact, is nothing but the pure nihilation of the In-itself; it is like a hole of being at the heart of Being.

It is not enough to accept a concept of order and live by it; that is cowardice, and such cowardice cannot result from freedom. Chaos must be faced. Real order must be preceded by a descent into chaos.

Of Every One-Hundred Men, Ten shouldn't even be there, Eighty are nothing but targets, Nine are real fighters... We are lucky to have them... They make the battle. Ah but the One, One of them is a Warrior... and He will bring the others back.

All mathematical laws which we find in Nature are always suspect to me, in spite of their beauty. They give me no pleasure. They are merely auxiliaries. At close range it is all not true.

It seems to me that the current political task in a society like ours is to criticize the working of institutions that are apparently the most neutral and independent, to criticize these institutions and attack them in such a way that the political violence that exercises itself obscurely through them becomes manifest, so that one can fight against them.

I think that democratic communities have a natural taste for freedom: left to themselves, they will seek it, cherish it, and view any privation of it with regret. But for equality, their passion is ardent, insatiable, incessant, invincible: they call for equality in freedom; and if they cannot obtain that, they still call for equality in slavery.

It is an unsufferable blasphemy to reject the public ministry or to say that people can become holy without sermons and Church. This involves a destruction of the Church and rebellion against ecclesiastical order; such upheavals must be warded off and punished like all other revolts.

As human beings, we are endowed with this freedom of choice, and we cannot shuffle off our responsibility upon the shoulders of God or nature. We must shoulder it ourselves. It is up to us.

But he has no fear; unconquered he looks down from a lofty height upon his sufferings.

Power tends to reduce openness... Power tries to solidify and stabilize its position by eradicating spaces open to play, or incalculable spaces.

We live in a world where there is more and more information, and less and less meaning.

Science tells us how to heal and how to kill; it reduces the death rate in retail and then kills us wholesale in war; but only wisdom - desire coordinated in the light of all experience - can tell us when to heal and when to kill. To observe processes and to construct means is science; to criticize and coordinate ends is philosophy: and because in these days our means and instruments have multiplied beyond our interpretation and synthesis of ideals and ends, our life is full of sound and fury, signifying nothing. For a fact is nothing except in relation to desire; it is not complete except in relation to a purpose and a whole. Science without philosophy, facts without perspective and valuation, cannot save us from havoc and despair. Science gives us knowledge, but only philosophy can give us wisdom.

The heart of Christianity is a myth which is also a fact.

Is it not the interest of the human race, that every one should be so taught and placed, that he would find his highest enjoyment to arise from the continued practice of doing all in his power to promote the well-being, and happiness, of every man, woman, and child, without regard to their class, sect, party, country or colour?

The weakest living creature, by concentrating his powers on a single object, can accomplish something. The strongest, by dispensing his over many, may fail to accomplish anything. The drop, by continually falling, bores its passage through the hardest rock. The hasty torrent rushes over it with hideous uproar, and leaves no trace behind.

The best thing about the sciences is their philosophical ingredient, like life for an organic body. If one dephilosophizes the sciences, what remains left? Earth, air, and water.

The fact of the religious vision, and its history of persistent expansion, is our one ground for optimism. Apart from it, human life is a flash of occasional enjoyments lighting up a mass of pain and misery, a bagatelle of transient experience.

The republican is the only form of government which is not eternally at open or secret war with the rights of mankind.

The issue here really is not whether international trade shall be free but whether or not it makes any sense for a country - or, for that matter, a region - to destroy its own capacity to produce its own food. How can a government, entrusted with the safety and health of its people, conscientiously barter away in the name of an economic idea that people's ability to feed itself? And if people lose their ability to feed themselves, how can they be said to be free?

I cannot live without books.

No position is so false as having understood and still remaining alive.

One of the great American tragedies is to have participated in a just war. It's been possible for politicians and movie-makers to encourage us we're always good guys. The Second World War absolutely had to be fought. I wouldn't have missed it for the world. But we never talk about the people we kill. This is never spoken of.

All things living are in search of a better world.

In the days before machinery men and women who wanted to amuse themselves were compelled, in their humble way, to be artists. Now they sit still and permit professionals to entertain them by the aid of machinery. It is difficult to believe that general artistic culture can flourish in this atmosphere of passivity.

He is worst of all, that is malicious against his friends.

We will freedom for freedom's sake, in and through particular circumstances. And in thus willing freedom, we discover that it depends entirely upon the freedom of others and that the freedom of others depends upon our own. Obviously, freedom as the definition of a man does not depend upon others, but as soon as there is a commitment, I am obliged to will the liberty of others at the same time as my own. I cannot make liberty my aim unless I make that of others equally my aim.

I consider one of the most important duties of any scientist the teaching of science to students and to the general public.

The utmost possible regarding an individual is a statement as to some order of probability about the future. Heisenberg's principle has been seized upon as a basis for wild statements to the effect that the doctrine of arbitrary free will and totally uncaused activity are now scientifically substantiated. Its actual force and significance is generalization of the idea that the individual is a temporal career whose future cannot logically be deduced from its past.

I know my heart, and have studied mankind; I am not made like any one I have been acquainted with, perhaps like no one in existence; if not better, I at least claim originality, and whether Nature did wisely in breaking the mould with which she formed me, can only be determined after having read this work. 

The present stage redefines the possibilities of man and nature in accordance with the new means available for their realization.

Whoever is a truly good man seeks a renown not by means of an ornament that does not belong to him but by means of his own virtue.

Money is everywhere but so is poetry. What we lack are the poets.

Environments work us over and remake us. It is man who is the content of and the message of the media, which are extensions of himself. Electronic man must know the effects of the world he has made above all things.

To believe in God is to yearn for His existence and, furthermore, it is to act as if He did exist.

The rich man... is always sold to the institution which makes him rich.

The first condition of unity is a subjective principle; and this principle in the Positive system is the subordination of the intellect to the heart: Without this the unity that we seek can never be placed on a permanent basis, whether individually or collectively. It is essential to have some influence sufficiently powerful to produce convergence amid the heterogeneous and often antagonistic tendencies of so complex an organism as ours.

Disbelieve nothing wonderful concerning the gods, nor concerning divine dogmas.