Proverbs 26:24 A malicious man disguises himself with his lips, but in his heart he harbor deceit.

2Corinthians 9:7-9 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. As it is written: "He has scattered abroad his gifts to the poor; his righteousness endures dorever."