“All is flux, nothing stays still”

“True opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.”

“Other people are likely not to be aware that those who pursue philosophy aright study nothing but dying and being dead. Now if this is true, it would be absurd to be eager for nothing but this all their lives, and then to be troubled when that came for which they had all along been eagerly practicing.”

“I am the wisest man alive, for I know one thing, and that is that I know nothing.”

“But the truth is, O men of Athens, that God only is wise; and by his answer he intends to show that the wisdom of men is worth little or nothing; he is not speaking of Socrates, he is only using my name by way of illustration, as if he said, He, O men, is the wisest, who, like Socrates, knows that his wisdom is in truth worth nothing.”

“And Agathon said, It is probable, Socrates, that I knew nothing of what I had said.And yet spoke you beautifully, Agathon, he said.”

“The soul of him who has education is whole and perfect and escapes the worst disease, but, if a man's education be neglected, he walks lamely through life and returns good for nothing to the world below.”