Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more.

Let the future tell the truth and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.

The present is theirs; the future, for which I really worked, is mine.

The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence.