Be forgiving with your past self. What's done is done. No sense in beating yourself up about it.
Be strict with your present self. Win the moment in front of you right now.
Be flexible with your future self. There are many paths to success. You don't need life to be a certain way to live well.
An underrated cheat code in life: being incredibly reliable. Show up on time. Do what you say you will. Own your mistakes. It goes so much further than you think.
Ideologies are substitutes for true knowledge, and ideologues are always dangerous when they come to power, because a simple-minded I-know-it-all approach is no match for the complexity of existence.