Wisdom alone is the science of other sciences.
Thinking: the talking of the soul with itself.
Knowledge becomes evil if the aim be not virtuous.
Opinion is the medium between knowledge and ignorance.
Human behavior flows from three main sources: desire, emotion, and knowledge.
And what, Socrates, is the food of the soul? Surely, I said, knowledge is the food of the soul.
A good decision is based on knowledge and not on numbers.
Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all; too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal.
It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters.
Knowledge is true opinion.