David

“Until we have begun to go without them, we fail to realize how unnecessary many things are. We've been using them not because we needed them but because we had them.”
― Lucius Annaeus Seneca, Letters from a Stoic

“Remember two things: i. that everything has always been the same, and keeps recurring, and it makes no difference whether you see the same things recur in a hundred years or two hundred, or in an infinite period; ii. that the longest-lived and those who will die soonest lose the same thing. The present is all that they can give up, since that is all you have, and what you do not have you cannot lose.”
― Marcus Aurelius, Meditations

“The things you think about determine the quality of your mind.”
― Marcus Aurelius, Meditations

“You should … live in such a way that there is nothing which you could not as easily tell your enemy as keep to yourself.”
― Lucius Annaeus Seneca, Letters from a Stoic