Bible Verses About Obedience to God: From the heart

`And it hath been--if thou hearken diligently unto My commands which I am commanding you to-day, to love Jehovah your God, and to serve Him with all your heart, and with all your soul--

and thanks to God, that ye were servants of the sin, and--were obedient from the heart to the form of teaching to which ye were delivered up;