I'm not a genius. I'm just a tremendous bundle of experience.

The more you like yourself, the less you are like anyone else, which makes you unique.

Genius is sorrow's child.

Dare to risk public criticism.

Extraordinary claims require extraordinary evidence.

After all, science is essentially international, and it is only through lack of the historical sense that national qualities have been attributed to it.

There is nothing like returning to a place that remains unchanged to find the ways in which you yourself have altered.

I am not a saint, unless you think of a saint as a sinner who keeps on trying.

A hero cannot be a hero unless in a heroic world.

Rich men's houses are seldom beautiful, rarely comfortable, and never original. It is a constant source of surprise to people of moderate means to observe how little a big fortune contributes to Beauty.

I fully realize that no wealth or position can long endure, unless built upon truth and justice; therefore, I will engage in no transaction which does not benefit all whom it affects.

There is no terror in the bang, only in the anticipation of it.

All of us have moments in our lives that test our courage. Taking children into a house with a white carpet is one of them.

Those who restrain desire do so because theirs is weak enough to be restrained.

He who never made a mistake, never made a discovery.

The idea of freedom is inspiring. But what does it mean? If you are free in a political sense but have no food, what's that? The freedom to starve?

Memories warm you up from the inside. But they also tear you apart.

The spirit of man is an inward flame; a lamp the world blows upon but never puts out.

Nothing is black or white.

I meant what I said and I said what I meant.

I want to put a ding in the universe.