All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another.
There is a certain impertinence in allowing oneself to be burned for an opinion.
In order that knowledge be properly digested it must have been swallowed with a good appetite.
Until you have loved an animal, part of your soul will have remained dormant.
Custom alone regulates morals.
It is the certainty that they possess the truth that makes men cruel.