Nothing in human affairs is worth any great anxiety.
For all good and evil, whether in the body or in human nature, originates ... in the soul, and overflows from thence, as from the head into the eyes.
Wisdom alone is the science of others sciences.
As there are misanthropists or haters of men, so also are there misologists, or haters of ideas.
The worst of all deceptions is self-deception.
True friendship can exist only between equals.