Psalms 106:14

14.And they lusted He goes on, according to the history, to mention the sin which, agreeably to the duty of his office as a teacher, he had briefly noticed. Should any one inquire in what way they did not attend to God’s counsel, he answers, because they had indulged in the gratification of their lusts; for the only way of acting with proper moderation is, when God rules and presides over our affections. It is therefore the more necessary to bridle that strong tendency to fleshly lusts which naturally rage within us. For whoever allows himself to desire more than is needful, openly sets himself in direct opposition to God, inasmuch as all fleshly lusts are directly opposed to him.

To tempt God is not to acquiesce in his will, but to desire more than he is willing to grant. And since there are a variety of modes of tempting God, the prophet here adverts to one mode of doing so, namely, that the people had been so presumptuous as to limit God to means of their own devising; and thus, in rejecting the way which they ought to have followed, they ascribed to God a property altogether novel, as much as to say, If God do not feed us with flesh we will not regard him as God. He gave them the food which ought to have satisfied them. And though God is not limited by any means whatsoever, yet it is his will that our minds be rendered subservient to the means which he has appointed. For instance, although he can nourish us without bread, nevertheless it is his will that our life be sustained by such provision; and if we neglect it, and wish to point out to him another way of nourishing us, we tempt his power.