1 — They don’t worry about things they have no control over.

Mentally strong people recognize that they don’t need to please everyone all the time. They’re not afraid to say no or speak up when necessary. They strive to be kind and fair, but can handle other people being upset if they didn’t make them happy.

• Circle of Influence: The things you can control - Attitude, education, skills you learn, enthusiasm, habits, hobbies, etc.
• Circle of Concern: The things you don't have control over - other's opinions, other's mistakes, the economy, what people think ...

• The single most important practice in Stoic philosophy is differentiation between what we can change and what we can't. What we have influence over and what we do not.
• There's something called Serenity prayer: "God, grant me the serenity to accept the things I cannot change, the cou...