For whom the Lord loveth he chasteneth,.... All men are not the objects of God's love, only a special people, whom he has chosen in Christ; for whom he has given his Son, when they were sinners and enemies; whom he quickens and calls by his grace, justifies, pardons, and accepts in Christ; and whom he causes to love him; these he loves with an everlasting and unchangeable love, and in a free and sovereign way, without any regard to any motive or condition in them.
Now these are chastened by him, and loved while they are chastened; their chastening is in love, as appears from the nature of God's love to them, which changes not; from the nature of chastening itself; which is that of a father; from the divine supports granted under it; from the ends of it, which are, among others, that they might be more and more partakers of holiness, and not be condemned with the world; and from the issue of it, which is a far more exceeding and eternal weight of glory.
So the Jews often speak of hbha lv Nyrwoy, "chastisements of love", in distinction from evil "chastisement", or vindictive ones:and scourgeth every son whom he receiveth; by whom are meant, not any of the angels, nor all the sons of men, but such whom God has predestinated to the adoption of children, and in the covenant of his grace has declared himself a father to; for whom Christ has a special regard, as children, and therefore partook of human nature, and died to gather them together, and redeemed them, that they might receive the adoption of children; and who appear to be the children of God by faith in Christ; and who have the spirit of adoption, witnessing their sonship to them; this is a valuable blessing of grace, and springs from love: and such are received by God into his heart's love and affection, with complacency and delight; and into the covenant of his grace, to share all the blessings and promises of it; and into his family, to enjoy all the privileges of his house, and into communion with himself; and they will be hereafter received by him into glory: now these he scourges; he suffers them sometimes to be scourged by men, and to be buffeted by Satan; and sometimes he scourges them himself with the rod of men, and with the stripes of the children of men, but always in love.
Zohar in Gen. fol. 39. 3. & 102. 4. & in Exod. fol. 98. 2. & 102. 2. & in Lev. fol. 19.