4:29-32 Filthy words proceed from corruption in the speaker, and they corrupt the minds and manners of those who hear them: Christians should beware of all such discourse. It is the duty of Christians to seek, by the blessing of God, to bring persons to think seriously, and to encourage and warn believers by their conversation. Be ye kind one to another. This sets forth the principle of love in the heart, and the outward expression of it, in a humble, courteous behaviour. Mark how God's forgiveness causes us to forgive. God forgives us, though we had no cause to sin against him. We must forgive, as he has forgiven us. All lying, and corrupt communications, that stir up evil desires and lusts, grieve the Spirit of God. Corrupt passions of bitterness, wrath, anger, clamour, evil-speaking, and malice, grieve the Holy Spirit. Provoke not the holy, blessed Spirit of God to withdraw his presence and his gracious influences. The body will be redeemed from the power of the grave at the resurrection day. Wherever that blessed Spirit dwells as a Sanctifier, he is the earnest of all the joys and glories of that redemption day; and we should be undone, should God take away his Holy Spirit from us.
30. grieve not—A condescension to human modes of thought most touching. Compare "vexed His Holy Spirit" (Isa 63:10; Ps 78:40); "fretted me" (Eze 16:43: implying His tender love to us); and of hardened unbelievers, "resist the Holy Ghost" (Ac 7:51). This verse refers to believers, who grieve the Spirit by inconsistencies such as in the context are spoken of, corrupt or worthless conversation, &c.
whereby ye are sealed—rather, "wherein (or 'in whom') ye were sealed." As in Eph 1:13, believers are said to be sealed "in" Christ, so here "in the Holy Spirit," who is one with Christ, and who reveals Christ in the soul: the Greek implies that the sealing was done already once for all. It is the Father "BY" whom believers, as well as the Son Himself, were sealed (Joh 6:27). The Spirit is represented as itself the seal (Eph 1:13, for the image employed, see on Eph 1:13). Here the Spirit is the element IN which the believer is sealed, His gracious influences being the seal itself.
unto—kept safely against the day of redemption, namely, of the completion of redemption in the deliverance of the body as well as the soul from all sin and sorrow (Eph 1:14; Lu 21:28; Ro 8:23).