God's happiness is your happiness. It's a mutual benefit between each other.
1.
He that begetteth a fool doeth it to his sorrow: and the father of a fool hath no joy.
2.
A merry heart doeth good like a medicine: but a broken spirit drieth the bones.
3.
These things have I spoken unto you, that my joy might remain in you, and that your joy might be full.
4.
This is my commandment, That ye love one another, as I have loved you.