Reason shows us our duty; he who can make us love our duty is more powerful than reason itself.

Affectation discovers sooner what one is than it makes known what one would fain appear to be.

Is it not astonishing that the love of repose keeps us in continual agitation?

Gaiety is the soul's health; sadness is its poison.

I know no real worth but that tranquil firmness which seeks dangers by duty, and braves them without rashness.

To make good use of life, one should have in youth the experience of advanced years, and in old age the vigor of youth.

Science when well-digested is nothing but good sense and reason.