Essence/Condensed Message of Stoicism

Stoic philosophy teaches that life's true value lies in focusing on what is within your control and accepting what is not, thereby cultivating inner tranquility. It emphasizes the importance of personal virtue, emotional resilience, and understanding the nature of the world through reason, all as means to achieve a content and fulfilled life.

We don't control what happens to us, but we do control how we react to it. - Ryan-Holiday

Start of Enchiridion by Epictetus

Epictetus starts his The Enchiridion (The Manual) book by

Some things we can control, some we can’t. ... What we can control naturally is not governed, restricted or constrained by others; what we can’t control is naturally governed, restricted and constrained by others. - The Enchiridion (The Manual)