Believing that you can do more will make it true. It enables you to go well beyond the limits that you’ve constructed for yourself in your own mind. And once you’ve felt the pain and the urge to give up at 10 push-ups only to push through it and do 20, you know that your mental strength helped you persevere. The next time you’re challenged, you’ll feel all the more capable and prepared to push past your supposed limits again. This embodies self-discipline in a nutshell—it’s really a matter of how much pain you can stomach, and most of us will only bend and never break.
