Each one of us must carry within the proof of immortality, it cannot be given from outside of us. To be sure, everything in natureis change but behind the change there is something eternal.

A stated truth loses its grace, but a repeated error appears insipid and ridiculous.

Most pioneers are at the mercy of doubt at the beginning, whether of their worth, of their theories, or of the whole enigmatic field in which they labour.

Certain books seem to be written, not that we might learn from them, but in order that we might see how much the author knows.

Nature does not suffer her veil to be taken from her, and what she does not choose to reveal to the spirit, thou wilt not wrest from her by levers and screws.

Help me to discover Thy truth, O Lord, and preserve me from those who have already found it

Reasonable men are the best dictionaries of conversation.