Love is a decision - not an emotion

The monotony and solitude of a quiet life stimulates the creative mind.

The truth of a theory is in your mind, not in your eyes.

The human mind has first to construct forms, independently, before we can find them in things.

It stands to the everlasting credit of science that by acting on the human mind it has overcome man's insecurity before himself and before nature.

To my mind, to kill in war is not a whit better than to commit ordinary murder