"Anyone who says sunshine brings happiness has never danced in the rain."
Unknown
"There are hundreds of languages in the world, but a smile speaks them all."
Unknown
"Remember, if you ever need a helping hand, you'll find one at the end of your arm... As you grow older you will discover that you have two hands. One for helping yourself, the other for helping others."
Why not try to say it a few times to yourself until you remember it. Repeat it whenever you are feeling uncertain within yourself. It will help you feel more positive.
Reading and remembering quotations is an excellent way to help improve your personal growth.