The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart.

Let your heart feel for the afflictions and distress of everyone, and let your hand give in proportion to your purse.

One ought to hold on to one's heart; for if one lets it go, one soon loses control of the head too.

It is better to be violent, if there is violence in our hearts, than to put on the cloak of nonviolence to cover impotence.

A scientific man ought to have no wishes, no affections, - a mere heart of stone.

A scientific man ought to have no wishes, no affections, - a mere heart of stone.

We all wish to be judged by our peers, by the men “after our own heart.

We all wish to be judged by our peers, by the men “after our own heart.

But the elastic heart of youth cannot be kept compressed into one constrained shape long at a time.