Only those faults which we encounter in ourselves are insufferable to us in others.

Life grows darker as we go on, till only one pure light is left shining on it; and that is faith. Old age, like solitude and sorrow, has its revelations.

We expect everything and are prepared for nothing.

Truth only is prolific. Error, sterile in itself, produces only by means of the portion of truth which it contains. It may have offspring, but the life which it gives, like that of the hybrid races, cannot be transmitted.

We are always looking into the future, but we see only the past.

Old age is not one of the beauties of creation, but it is one of its harmonies.

I study much, and the more I study, the oftener I go back to those first principles which are so simple that childhood itself can lisp them.