I will give you a new heart and put a new spirit in you; I will remove from you your heart of stone and give you a heart of flesh. And I will put my Spirit in you and move you to follow my decrees and be careful to keep my laws.
Here is a way to turn that scripture into a prayer for your sons (or daughters or yourself). :)
Dear Jesus, please give _____ a new heart and put a new spirit in him. Please remove his heart of stone and replace it with a heart of flesh. Help _____ to follow your decrees as You put Your Spirit in him. Help _____ to be careful to keep Your laws. Amen