No man is born wise; but wisdom and virtue require a tutor; though we can easily learn to be vicious without a master.
Seneca the YoungerI never come back home with the same moral character I went out with; something or other becomes unsettled where I had achieved internal peace; some one or other of the things I had put to flight reappears on the scene.
Seneca the YoungerThe stomach begs and clamors, and listens to no precepts. And yet it is not an obdurate creditor; for it is dismissed with small payment if you give it only what you owe, and not as much as you can.
Seneca the Younger