But, sir, is the bare observing and doing of these things sufficient for keeping of this commandment perfectly?

Oh no! The first commandment must be understood in all the rest, that is, the obedience to the first commandment must be the motive and final cause of our obedience to the rest of the commandments, otherwise it is not the worship of God, but hypocrisy, as I touched before; wherefore, neighbour Nomologista, though you have done all the duties the Lord requires in this commandment, and avoided all the sins which he forbids, yet, if all this has been from such grounds, and to such ends, as I told you of in the conclusion of the second commandment, and not for the love you bear to God, and the desire you have to please him, you come short of keeping this commandment perfectly.

 

Edward Fisher, The Marrow of Modern Divinity