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We are all afraid for our confidence, for the future, for the world. That is the nature of the human imagination. Yet every man, every civilization, has gone forward because of its engagement with what it has set itself to do.

Man masters nature not by force but by understanding. This is why science has succeeded where magic failed: because it has looked for no spell to cast over nature.

Ask yourself whether the dream of heaven and greatness should be waiting for us in our graves – or whether it should be ours here and now and on this earth.

When truth has no burning, then it is philosophy, when it gets burning from the heart, it becomes poetry.

We know accurately only when we know little, with knowledge doubt increases.

There is not enough religion in the world even to destroy religion.

Let your soul stand cool and composed before a million universes.

Man has, as it were, become a kind of prosthetic God. When he puts on all his auxiliary organs, he is truly magnificent; but those organs have not grown on him and they still give him much trouble at times.

I fear that, in the end, the famous debate among materialists, idealists, and dualists amounts to a merely verbal dispute that is more a matter for the linguist than for the speculative philosopher.

If you gain, you gain all. If you lose, you lose nothing. Wager then, without hesitation, that He exists.