Pessimism is the one ism which kills the soul.

An atheist is a man who has no invisible means of support.

I believe that all wisdom consists in caring immensely for a few right things, and not caring a straw about the rest.

It's a great life, if you don't weaken.

The task of leadership is not to put greatness into people, but to elicit it, for the greatness is there already.

I wondered whether the scientific modern brain could not get to the stage of realising that Space is not an empty homogeneous medium, but full of intricate differences, intelligible and real, though not with our common reality.

That is the supreme value of history. The study of it is the best guarantee against repeating it.