These [false teachers] complain about their circumstances. They are grumblers who are never satisfied. And the reason for this is that they seek satisfaction only in the things of this world, which can never satisfy. For true satisfaction exists only in the spiritual realm, and in our being connected with the One who is utterly limitless. Jehovah God, the self-existent One, from whom and to whom all creation is—he is the only One who is infinite, and thus boundless and never to be exhausted. There will never be an end or a limit unto our God, and therefore he is the only One in whom satisfaction will ever be found. Pursue satisfaction through accumulating stuff on this world, and when you have gotten it all, you still will not have enough.1
John McKnight
16 These are grumblers, malcontents, following their own sinful desires; they are loud-mouthed boasters, showing favoritism to gain advantage.