The core of Aurelius’s philosophy is the distinction between what we can control and what we cannot. He famously argued that while we cannot control the weather, the economy, or the opinions of others, we have absolute sovereignty over our own minds. He called this the "Inner Citadel."
If someone is rude to you, they have given you an opportunity to practice patience. If you fail at a task, you have gained the opportunity to practice humility and learning. In this light, there is no such thing as a "bad" day—only a series of opportunities to test your virtues. The Big Picture (Cosmopolis) Marcus Aurelius: A Guide for the Perplexed
Perhaps his most famous insight is that "the impediment to action advances action. What stands in the way becomes the way." Marcus didn't see problems as interruptions to his life; he saw them as the raw material of his life. The core of Aurelius’s philosophy is the distinction
