“Do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption” (Eph. 4:30).
We sometimes forget that the Holy Spirit is the person of the Godhead who indwells us. Since He is person, He can be grieved. Any behavior which is contrary to the holiness of God grieves the Holy Spirit. In the immediate context, when behavior patterns which belong to the old man are repeated in the man who has been made new, it grieves the Holy Spirit who indwells us.
The linking of verse 29 and 30 suggest that speech which does not edify grieves the Spirit. If Paul is here thinking about speech which occurs between two believers, the Holy Spirit is doubly grieved since He indwells both speaker and hearer. Thus unwholesome speech breaks down the common life of the body. When we sin against a fellow-believer it is an offense against the Spirit Himself who gives unity to the body.
We have already seen that all believers receive the Spirit as a pledge of the inheritance which will be ours on that day when God claims us as His own (1:13f). We have also seen how the Spirit gives unity to the body (4:3) enabling it to function in such a manner that it grows up into all aspects into Christ. We are one body in Christ and thus we must seek to live in community in such a manner that God is glorified and the unity of the Spirit is maintained.
Prayer: Father, forgive me when my attitude or words grieve Your Spirit. Amen