Kahneman — “If you have had to force yourself to…”
Source: Thinking, Fast and Slow — Daniel Kahneman
Book page: kahneman-thinking-fast-and-slow
From: Daniel Kahneman — Quotes
if you have had to force yourself to do something, you are less willing or less able to exert self-control when the next challenge comes around. The phenomenon has been named ego depletion.