It is far better for a man to go wrong in freedom than to go right in chains.
A man's worst difficulties begin when he is able to do as he likes.
Misery is a match that never goes out.
Science is organized common sense where many a beautiful theory was killed by an ugly fact.
The more rapidly truth is spread among mankind the better it will be for them. Only let us be sure that it is the truth.
The secret of genius is to carry the spirit of childhood into maturity.