All I really know is the extent of my own ignorance

Not one of them who took up in his youth with this opinion that there are no gods ever continued until old age faithful to his conviction.

He who advises a sick man, whose manner of life is prejudicial to health, is clearly bound first of all to change his patient's manner of life.

They ought to be gentle to their friends and dangerous to their enemies.

Welcome out of the cave, my friend. It's a bit colder out here, but the stars are just beautiful.

And isn't it a bad thing to be deceived about the truth, and a good thing to know what the truth is? For I assume that by knowing the truth you mean knowing things as they really are.

No human thing is of serious importance.