Develop a strong attachment to your good looks – as opposed to merely enjoying them while they last – and you will suffer when they fade, as they inevitably will; develop a strong attachment to your luxurious lifestyle, and your life may become an unhappy, fearful struggle to keep things that way. Attach too strongly to life, and death will seem all the more frightening.

And here lies the essential difference between Stoicism and the modern-day 'cult of optimism.' For the Stoics, the ideal state of mind was tranquility, not the excitable cheer that positive thinkers usually seem to mean when they use the word, 'happiness.' And tranquility was to be achieved not by strenuously chasing after enjoyable experiences, but by cultivating a kind of calm indifference towards one's circumstances.

For the Stoics, then, our judgments about the world are all that we can control, but also all that we need to control in order to be happy; tranquility results from replacing our irrational judgments with rational ones

Mainly, it’s not that there are things you can’t say. It’s that there are things you can’t say without the risk that people who previously lacked a voice might use their own freedom of speech to object.

Negative Capability, that is, when a man is capable of being in uncertainties, mysteries, doubts, without any irritable reaching after fact and reason 

Sometimes the most valuable of all talents is to be able not to seek resolution; to notice the craving for completeness or certainty or comfort, and not to feel compelled to follow where it leads.