What Is The Gravity of Past Success?

A common sense definition from Garry Kasparov’s Winter is Coming:

“Each victory pulls the victor down slightly and makes it harder to put in maximum effort to improve further. Meanwhile, the loser knows that he made a mistake, that something went wrong, and he will work hard to improve for next time. The happy winner often assumes he won simply because he is great. Typically, however, the winner is just the player who made the next-to-last mistake. It takes tremendous discipline to overcome this tendency and to learn lessons from a victory.”