The law of common sense.

Indifferent souls never part. Impassioned souls part, and return to one another, because they can do no better.

We are rich only through what we give.

There is nothing steadfast in life but our memories. We are sure of keeping intact only that which we have lost.

The very might of the human intellect reveals its limits.

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.

Youth should be a savings bank.