Each man should give what he has decided in his heart to give, not reluctantly or under compulsion, for God loves a cheerful giver. And God is able to make all grace abound to you, so that in all things at all times, having all that you need, you will abound in every good work.

What does the Bible say about a glad heart?

Proverbs 17:22 tells us, "A merry heart doeth good like a medicine: but a broken spirit drieth the bones."

What does do it with all your heart mean?

phrase. If you feel or believe something with all your heart, you feel or believe it very strongly.