The value of a man should be seen in what he gives and not in what he is able to receive.

Only a monomaniac gets anything done.

People start their lives at last when they are able to live for something other than themselves.

Out of the multitude of our sense experiences we take, mentally and arbitrarily, certain repeatedly occurring complexes of sense impression (partly in conjunction with sense impressions which are interpreted as signs for sense experiences of others), and we attribute to them a meaning the meaning of the bodily object.

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

Never underestimate your own ignorance.

The finest emotion of which we are capable is the mystic emotion.