To be adult is to be alone.

Theories pass. The frog remains.

God, that checkroom of our dreams.

Kill one man, and you are murderer.

God, that dumping ground of our dreams.

To reflect is to disturb one's thoughts.

The biologist passes. The frog stays the same.

In our ideals we unwittingly reveal our vices.

Marriage simplifies life and complicates the day.

Beauty in art is often nothing but ugliness subdued.

A man is not old as long as he is seeking something.

Think? Why think! We have computers to do that for us.

There are things that don't deserve to be said briefly.

It takes a very deep-rooted opinion to survive unexpressed.

Nothing leads the scientist so astray as a premature truth.

To love an idea is to love it a little more than one should.

We spend our time envying people whom we wouldn't wish to be.

Truth is always served by great minds, even if they fight it.

On the brink of being satiated, desire still appears infinite.

Science has made us gods even before we are worthy of being men.

Being right is less important to us than the freedom to be wrong.

In politics, yesterday's lie is attacked only to flatter today's.

There are big and little truths, but all belong to the same race.

Prerequisite for rereadability in books: that they be forgettable.

When I was young I pitied the old. Now old, it is the young I pity.

I prefer the honest jargon of reality to the outright lies of books.

To live is often to struggle toward goals one has no desire to reach.

In art as in life the valid sacrifices are those that bring no income.

The least one can say of power is that a vocation for it is suspicious.

Kill one man and you're a murderer, kill a million and you're a conqueror.

Quotations--always inexact. I don't trust people who cannot even copy out.

The ideal, without doubt, varies, but its enemies, alas, are always the same.

It is sometimes well for a blatant error to draw attention to overmodest truths.

The nobility of a human being is strictly independent of that of his convictions.

Le biologiste passe, la grenouille reste. The biologist passes, the frog remains.

Take heed of critics even when they are not fair; resist them even when they are.

I still understand a few words in life, but I no longer think they make a sentence.

Greatness, in order to gain recognition, must all too often consent to ape greatness.

Already at the origin of the species man was equal to what he was destined to become.

There are certain moments when we might wish the future were built by men of the past.

The divine is perhaps that quality in man which permits him to endure the lack of God.

In order to remain true to oneself one ought to renounce one's party three times a day.

My pessimism extends to the point of even suspecting the sincerity of other pessimists.

One must either take an interest in the human situation or else parade before the void.

It is sometimes important for science to know how to forget the things she is surest of.

We must watch over our modesty in the presence of those who cannot understand its grounds.

Science had better not free the minds of men too much, before it has tamed their instincts.

There are some persons we could not cut down to size without diminishing ourselves as well.

Far too often the choices reality proposes are such as to take away one's taste for choosing.

One must credit an hypothesis with all that has had to be discovered in order to demolish it.

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