To understand is to perceive patterns.
The more you're in the state of flow, the more you'll develop skills, the more you'll achieve, and the more you'll feel good about yourself.
The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.
Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work.