Obedience to God: should be from the Heart
Source: TTT
Deuteronomy 11:13
So if you carefully obey the commandments I am giving you today, to love the LORD your God and to serve Him with all your heart and with all your soul,
Romans 6:17
But thanks be to God that, though you once were slaves to sin, you wholeheartedly obeyed the form of teaching to which you were committed.