A couple ones I personally love:
“Only I can make myself feel better because they’re my feelings”
“Who do you think will end up living with me forever? It’s me. Myself. And in your case, it’s you. So you need to take good care of yourself and fix yourself whenever something breaks”
“Why not include your failures as part of the process? It’s also a part of your journey to success”
Try it first. If it doesn’t work out, you can give up then.
“When you’re tired, get some rest. When you’re sad, go ahead and cry. It’s okay to take a break. Then one day, there will surely come a day when you’ll be able to run again”
“I really want to get along with myself. I don’t want to love myself too much, but I don’t want to be too hard on myself either. I think finding a good balance between these is like a homework for life”