28] Let every one, then, see to it that he esteem this commandment great and high above all things, and do not regard it as a joke. Ask and examine your heart diligently, and you will find whether it cleaves to God alone or not. If you have a heart that can expect of Him nothing but what is good, especially in want and distress, and that, moreover, renounces and forsakes everything that is not God, then you have the only true God. If, on the contrary, it cleaves to anything else, of which it expects more good and help than of God, and does not take refuge in Him, but in adversity flees from Him, then you have an idol, another god.
47] Let us, then, learn well the First Commandment, that we may see how God will tolerate no presumption nor any trust in any other object, and how He requires nothing higher of us than confidence from the heart for everything good, so that we may proceed right and straightforward and use all the blessings which God gives no farther than as a shoemaker uses his needle, awl, and thread for work, and then lays them aside, or as a traveler uses an inn, and food, and his bed only for temporal necessity, each one in his station, according to God’s order, and without allowing any of these things to be our lord or idol.
48] Let this suffice with respect to the First Commandment, which we have had to explain at length, since it is of chief importance, because, as before said, where the heart is rightly disposed toward God and this commandment is observed, all the others follow.