Normal science, the puzzle-solving activity we have just examined, is a highly cumulative enterprise, eminently successful in its aim, the steady extension of the scope and precision of scientific knowledge. In all these respects it fits with great precision the most usual image of scientific work. Yet one standard product of the scientific enterprise is missing. Normal science does not aim at novelties of fact or theory and, when successful, finds none.

Newton... (after having remarked that geometry only requires two of the mechanical actions which it postulates, namely, to describe a straight line and a circle) says: geometry is proud of being able to achieve so much while taking so little from extraneous sources. One might say of metaphysics, on the other hand: it stands astonished, that with so much offered it by pure mathematics it can effect so little. In the meantime, this little is something which mathematics indispensably requires in its application to natural science, which, inasmuch as it must here necessarily borrow from metaphysics, need not be ashamed to allow itself to be seen in company with the latter.

Parmenides: If anyone, with his mind fixed on all these objections and others like them, denies the existence of ideas of things, and does not assume an idea under which each individual thing is classed, he will be quite at a loss, since he denies that the idea of each thing is always the same, and in this way he will utterly destroy the power of carrying on discussion... Then what will become of philosophy? To what can you turn, if these things are unknown?

When we read the best nineteenth- and twentieth-century novelists, we soon realize that they are trying in a variety of ways to establish a definition of human nature, to justify the continuation of life as well as the writing of novels.

The successful revolutionary is a statesman, the unsuccessful one a criminal.

I have often felt a bitter sorrow at the thought of the German people, which is so estimable in the individual and so wretched in the generality. A comparison of the German people with other peoples arouses a painful feeling, which I try to overcome in every possible way.

Unpleasant, even dangerous, qualities can be found in every nation and every individual: it is cruel to demand that the Jew be an exception. In him, these qualities may even be dangerous and revolting to an unusual degree; and perhaps the young stock-exchange Jew is altogether the most disgusting invention of mankind.

There is needed, no doubt, a body of servants (ministerium) of the invisible church, but not officials (officiales), in other words, teachers but not dignitaries, because in the rational religion of every individual there does not yet exist a church as a universal union (omnitudo collectiva).

Applaud us when we run, console us when we fall, cheer us when we recover.

Continuously thou wilt look at human things as smoke and nothing at all; especially if thou reflectest at the same time, that what has once changed will never exist again in the infinite duration of time. But thou, in what a brief space of time is thy existence? And why art thou not content to pass through this short time in an orderly way?

The difference between the first- and second-best things in art absolutely seems to escape verbal definition - it is a matter of a hair, a shade, an inward quiver of some kind - yet what miles away in the point of preciousness!

Even when the experts all agree, they may well be mistaken.

With a few glorious and glaring exceptions, the shadow of Jim Crow was cast in its new glittering form expressed in the language of superficial diversity... The disarray of a scattered curriculum, the disenchantment of talented yet deferential faculty, and the disorientation of precious students loom large... To witness a faculty enthusiastically support a candidate for tenure then timidly defer to a rejection based on the Harvard administration's hostility to the Palestinian cause was disgusting... We all know the mendacious reasons given had nothing to do with academic standards... This kind of narcissistic academic professionalism, cowardly deference to the anti-Palestinian prejudices of the Harvard administration, and indifference to my Mother's death constitutes an intellectual and spiritual bankruptcy of deep deaths...

This is the moment of greatest crisis. This is the signal for the March to begin. If you do not hear this Cry tearing at your entrails, do not set out.

The pious soul,-which, if you reflect, will mean the ingenuous and ingenious, the gifted, intelligent and nobly-aspiring soul,-such a soul, in whatever rank of life it were born, had one path inviting it; a generous career, whereon, by human worth and valor, all earthly heights and Heaven itself were attainable. In the lowest stratum of social thraldom, nowhere was the noble soul doomed quite to choke, and die ignobly.

I have never yet seen any plan which has not been mended by the observation of those who were much inferior in understanding to the person who took the lead in the business.

Darwin's 'survival of the fittest' is really a special case of a more general law of survival of the stable. The universe is populated by stable things. The universe is populated by stable things. A stable thing is a collection of atoms that is permanent enough or common enough to deserve a name. It may be a unique collection of atoms, such as the Matterhorn, that lasts long enough to be worth naming. Or it may be a class of entities, such as rain drops, that come into existence at a sufficiently high rate to deserve a collective name, even if any one of them is short-lived.

Harvard now, I think, suffers from a kind of self-idolatry, that it needs to be critical of itself in order to grow. And again, if you can be in contact with the best of its past, then it's got a chance. But if it just remains well adjusted to the status quo, generating careerist and opportunist students rather than critically oriented students who have a heart and soul, concerned about suffering here and around the world - then Harvard has a chance. I'm not giving up on Harvard, but I am making my way to New York.

To ruminate upon evils, to make critical notes upon injuries, and be too acute in their apprehensions, is to add unto our own tortures, to feather the arrows of our enemies, to lash ourselves with the scorpions of our foes, and to resolve to sleep no more.

All men and women have passions, natural desires and noble ambitions, and also a conscience; they have sex, hunger, fear, anger, and are subject to sickness, pain, suffering and death. Culture consists in bringing about the expression of these passions and desires in harmony.

The safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato.

Treat your inferiors as you would be treated by your betters.

I should unconditionally refuse every direct or indirect war service and try to induce my friends to adopt the same attitude, irrespective of the general opinion of the causes of war.

The law of gravity thus asserts itself when a house falls about our ears.

Two equally steep and bold paths may lead to the same peak. To act as if death did not exist, or to act thinking every minute of death, is perhaps the same thing.

Whatever we may do, excess will always keep its place in the heart of man, in the place where solitude is found. We all carry within us our places of exile, our crimes and our ravages. But our task is not to unleash them on the world; it is to fight them in ourselves and in others.

Evangelical atheists preach the need for a scientific view of things, but a settled view does not go with scientific method. If we know anything it is that most of the theories that prevail at any one time are false. Scientific theories are not components of a world-view but tools we use to tinker with the world.

United States! the ages plead, - Present and Past in under-song, - Go put your creed into your deed, Nor speak with double tongue.

Tragic paradox of freedom: the mediocre men who alone make its exercise possible cannot guarantee its duration.

He also said to them, "You completely invalidate God's command in order to maintain your tradition! For Moses said: Honor your father and your mother; and, Whoever speaks evil of father or mother must be put to death.

Tyrants seldom want pretexts.

Even serious students are misled by the myth of the subject.

He who created us without our help will not save us without our consent.

Now who are the individuals who are the greatest benefactors of the living generation of mankind? I should say: Confucius and Lao-Tse; the Buddha; the Prophets of Israel and Judah; Zoroaster, Jesus, Muhammad; and Socrates.

Whoever will be free must make himself free. Freedom is no fairy gift to fall into a man's lap. What is freedom? To have the will to be responsible for one's self.

There is no history of mankind, there is only an indefinite number of histories of all kinds of aspects of human life. And one of these is the history of political power. This is elevated into the history of the world. But this, I hold, is an offence against every decent conception of mankind. It is hardly better than to treat the history of embezzlement or of robbery or of poisoning as the history of mankind. For the history of power politics is nothing but the history of international crime and mass murder (including it is true, some of the attempts to suppress them). This history is taught in schools, and some of the greatest criminals are extolled as heroes. 

So far no one had had enough courage and intelligence to reveal me to my dear Germans. My problems are new, my psychological horizon frighteningly comprehensive, my language bold and clear; there may well be no books written in German which are richer in ideas and more independent than mine.

Pain will force even the truthful to speak falsely.

When some one reminded him that the people of Sinope had sentenced him to exile, he said, "And I sentenced them to stay at home."

Let each look to his own heart: let him not keep hatred against his brother for any hard word; on account of earthly contention let him not become earth.

Since Sputnik and the satellites, the planet is enclosed in a manmade environment that ends "Nature" and turns the globe into a repertory theater to be programmed.

Since he is unable to be the beloved, he will become the lover.

Do not be frightened from this inquiry by any fear of its consequences. If it ends in a belief that there is no god, you will find incitements to virtue in the comfort and pleasantness you feel in its exercise, and the love of others which it will procure you. If you find reason to believe there is a God, a consciousness that you are acting under his eye, and that he approves you, will be a vast additional incitement; if that there be a future state, the hope of a happy existence in that increases the appetite to deserve it; if that Jesus was also a god, you will be comforted by a belief of his aid and love.

By God's grace, I know Satan very well. If Satan can turn God's Word upside down and pervert the Scriptures, what will he do with my words -- or the words of others?

What we want is not freedom but its appearances. It is for these simulacra that man has always striven. And since freedom, as has been said, is no more than a sensation, what difference is there between being free and believing ourselves free?

Ye do err, not knowing the scriptures, nor the power of God. For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven. But as touching the resurrection of the dead, have ye not read that which was spoken unto you by God, saying, I am the God of Abraham, and the God of Isaac, and the God of Jacob? God is not the God of the dead, but of the living.

A good indignation brings out all one's powers.