A scientific approach means knowing what one knows and what one doesn't. Absolute or complete knowledge is unscientific.

The moment is the sole reality.

Greatness of mind becomes an object of love only when the power at work in it itself has a noble character

What makes us afraid is our great freedom in the face of the emptiness that has still to be filled.

We must learn to talk with each other, and we mutually must understand and accept one another in our extraordinary differences.

There is no God, cry the masses more and more vociferously; and with the loss of God man loses his sense of values — is, as it were, massacred because he feels himself of no account.

Only in those moments when I exercise my freedom am I fully myself.

On the question of the world as a whole, science founders. For scientific knowledge the world lies in fragments, the more so the more precise our scientific knowledge becomes.

Reason is like an open secret that can become known to anyone at any time; it is the quiet space into which everyone can enter through his own thought

Philosophy as practice does not mean its restriction to utility or applicability, that is, to what serves morality or produces serenity of soul.

Only then, approaching my fortieth birthday, I made philosophy my life's work.

Life has enough torturers as it is, without you going around moonlighting as a Grand Inquisitor against yourself.

God gives us always strength enough and sense enough for everything He wants us to do.

Space architectures capable of supporting a permanent human presence on Mars are extraordinarily complex, with many different interdependent systems.

It makes you wonder. All the brilliant things we might have done with our lives if only we suspected we knew how.

Actually it seems to me that one can hardly say anything either bad enough or good enough about life.

You feel that no matter what's said in the music or how pointed it may get, the most you can wish for is that it plants a few seeds.

The entrepreneurial mind-set is that risk is the heightened probability that there is a big range of possible outcomes.

Yet my great-grandfather was but a water-man, looking one way and rowing another: and I got most of my estate by the same occupation.

The winters will drive you crazy until you learn to get out into them.

The arts and humanities teach us who we are and what we can be. They lie at the very core of the culture of which we're a part.