Here are a few of my favorites from the book of Proverbs.
"Do not withhold good from those who deserve it, when it is in your power to act." 3:27
"Above all else, guard your heart, for it is the wellspring of life. Put away perversity from your mouth; keep corrupt talk far from your lips." 4:23-24
"A kindhearted woman gains respect, but ruthless men gain only wealth." 11:16
You hear that, men?
And my personal favorite:
"A happy heart makes the face cheerful." 15:13