(4.) He promises them a share in his grace now: I will spare them as a man spares his own son that serves him. God had promised to own them as his and take them to be with him; but it might be a discouragement to them to think that they had offended God, and that he might justly disown them, and cast them off; but, as to that, he says, "I will spare them; I will not deal with them as they deserve. I will rejoice over them" (so some expound it) "as the bridegroom over his bride," Isa. lxii. 5; Zeph. iii. 17. But the word usually signifies to spare with commiseration and compassion, as a father pities his children, Ps. ciii. 13. Note, [1.] It is our duty to serve God with the disposition of children. We must be his sons, must by a new birth partake of a divine nature, must consent to the covenant of adoption and partake of the spirit of adoption. And we must be his servants; God will not have his children trained up in idleness; they must do him service, and they must do it from a principle of love, with cheerfulness and delight, and as those that are therein serving their own true interest, and this is serving as a son with the father, Phil. ii. 22. [2.] If we serve God with the disposition of children, he will spare us with the tenderness and compassion of a Father. Even God's children that serve him stand in need of sparing mercy, that mercy to which we owe it that we are not consumed, that mercy which keeps us out of hell. Nehemiah, when he had done much good, yet, knowing there is not a just man on earth, that does good and sins not, and that every sin deserves God's wrath, prays, Lord, spare me according to the greatness of thy mercy; see Neh. xiii. 22. And God, as a Father, will show them this mercy. He will not be extreme to mark what we do amiss, but will make the best of us and our poor performances; he will mitigate the afflictions his children are exercised with, and save them from the ruin they deserve. The father continues to spare the son, and does it with complacency, because he is his own; thus God will spare humble penitents and petitioners, as a man spares his son that serves him, though we do him so little service, nay, though we do him so much disservice.