
The best way to cheer yourself
is to try to cheer someone else up.
- Mark Twain
Laugh when you can,
apologize when you should,
and let go of what you can't change.
Life's too short to be anything... but happy.
- Anonymous
The foolish man seeks happiness in the distance;
the wise grows it under his feet.
- J. Robert Oppenheimer
A happy life consists not in the absence,
but in the mastery of hardships.
- Helen Keller
Further reading: Ten Little Tips to Feel Happier Right Now
Secrets for a Happy Life
The Secret of Happiness