John Calvin comments on today’s passage: God is only rightly served when his law is obeyed. It is not left to every man to frame a system of religion according to his own judgment, but the standard of godliness is to be taken from the Word of God.
No one can serve two masters. Either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve both God and Money.
