Plato
“Opinion is the medium between knowledge and ignorance.”
“I am the wisest man alive, for I know one thing, and that is that I know nothing.”
“The heaviest penalty for declining to rule is to be ruled by someone inferior to yourself.”
“Necessity is the mother of invention.”
“Love is a serious mental disease.”
“At the touch of love everyone becomes a poet.”
“He who commits injustice is ever made more wretched than he who suffers it.”
“The first and greatest victory is to conquer yourself.”
“Ignorance, the root and stem of all evil.”
“Courage is knowing what not to fear.”
“The beginning is the most important part of the work.”
“The unexamined life is not worth living.”