There are but two roads that lead to an important goal and to the doing of great things: strength and perseverance. Strength is the lot of but a few privileged men; but austere perseverance, harsh and continuous, may be employed by the smallest of us and rarely fails of its purpose, for its silent power grows irresistibly greater with time.

Keep not standing fixed and rooted. Briskly venture, briskly roam.

In all times it is only individuals that have advanced science, not the age.

Some people spend the day in complaining of a headache, and the night in drinking the wine that gives it.

Association with women is the basis of good manners.

If everyone sweeps before his own front door, then the street is clean.

Nature knows no pause in progress and development, and attaches her curse on all inaction.