All human actions have one or more of these seven causes: chance, nature, compulsions, habit, reason, passion, desire.

The problems of victory are more agreeable than those of defeat, but they are no less difficult. 

When grand plans for scientific and defence technologies are made, do the people in power think about the sacrifices the people in the laboratories and fields have to make?

I think and think for months and years. Ninety-nine times, the conclusion is false. The hundredth time I am right.

Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young. 

I do not believe a man can ever leave his business. He ought to think of it by day and dream of it by night. Henry Ford A bore is a person who opens his mouth and puts his feats in it. 

No culture can live if it attempts to be exclusive.

No one wants to die. Even people who want to go to heaven don't want to die to get there. And yet death is the destination we all share. No one has ever escaped it. And that is as it should be, because Death is very likely the single best invention of Life. It is Life's change agent. It clears out the old to make way for the new.

A man is but the product of his thoughts what he thinks, he becomes.

We pledge ourselves to liberate all our people from the continuing bondage of poverty, deprivation, suffering, gender and other discrimination.

The whole secret of existence is to have no fear. Never fear what will become of you, depend on no one. Only the moment you reject all help are you freed.

Eating words has never given me indigestion.