Remind yourself often that you are mentally strong — you can do it.
Determination is a mental quality, so just as we can train the body, we can train the mind. When life is challenging, tell yourself often that you are equal to the challenge — you can do it. Remind yourself that hanging in just a bit longer can make all the difference. Repeat one or more of these phrases often throughout the day: "I don't quit!" "I am strong!" "Yes, I can!" To paraphrase Gandhi: be the change you want to see in the world.
— Allan Lokos in Pocket Peace