To preserve an unclouded capacity for the enjoyment of life is an unusual moral and psychological achievement. Contrary to popular belief, it is not the prerogative of mindlessness, but the exact opposite: It is the reward of self-esteem.
It is very easy in the world to live by the opinion of the world. It is very easy in solitude to be self-centered. But the finished man is he who in the midst of the crowd keeps with perfect sweetness the independence of solitude.
SELF-ESTEEM controls PERFORMANCE/REALITY which stimulate SELF-TALK which reinforces SELF-ESTEEM. This cycle can work positively or negatively and is greatly influenced by the self-talk (I knew I wasn't good at -X vs. next time I'll practice and do better at -X).