True obedience to God is the obedience of faith and good works; that is, he is truly obedient to God who trusts Him, and does what He commands.
Leave the ass burdened with laws behind in the valley. But your conscience, let it ascend with Isaac into the mountain. Commentary on the Epistle to the Galatians (1535)
Put thou thy trust in God;In duty's path go on;Fix on His word thy steadfast eye;So shall thy work be done.