Difficulty is what wakes up the genius.
What is now an act of reason, was but blind impulse.
What is without periods of rest will not endure.
Envy feeds on the living, after death it rests, then the honor of a man protects him.
A thousand ills require a thousand cures.
What is more useful than fire? Yet if any one prepares to burn a house, it is with fire that he arms his daring hands.