The spirit in which a thing is given determines that in which the debt is acknowledged; it's the intention, not the face-value of the gift, that's weighed.

It does not matter how many books you have, but how good the books are which you have.

The mind is never right but when it is at peace within itself.

Many discoveries are reserved for ages still to come . . . . Our universe is a sorry little affair unless it has in it something for every age to investigate.

Pain, scorned by yonder gout-ridden wretch, endured by yonder dyspeptic in the midst of his dainties, borne bravely by the girl in travail. Slight thou art, if I can bear thee, short thou art if I cannot bear thee!

To be feared is to fear. No one has been able to strike terror into others and at the same time enjoy peace of mind.

Whoever has nothing to hope, let him despair of nothing.