“Don’t talk to yourself in such a way that if you did so to a friend, it would end your friendship. If you had a friend dealing with the same things, you wouldn’t berate that person, say, ‘You’re not working hard enough,’ ‘You suck,’ or ‘You’re not as good as [whomever].’ You’d offer your friend encouragement, you’d try to point out all the things your friend did right, and how much progress your friend had made.
You should do no less for yourself.

Be very careful how you talk to yourself. Because you are listening.”