Grieving the Spirit is the sorrow caused to the indwelling Holy Spirit by the believer’s sin—a relational wounding of the divine Person who dwells within, against which Paul solemnly warns: “And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.” The very command testifies powerfully to the Spirit’s personhood, for one cannot grieve a force or an influence; grief is the response of a person who loves. The Spirit, dwelling in the believer as in a temple, is grieved—made sorrowful as a loving friend is wounded—by the sins that defile that temple and contradict His holy character. The context in Ephesians specifies what grieves Him: lying, sinful anger, theft, corrupt speech, bitterness, wrath, clamor, evil speaking, and malice; and conversely He is pleased by kindness, tenderheartedness, and forgiveness. To grieve the Spirit is not to drive Him away—the believer remains sealed by Him unto the day of redemption, for the indwelling is permanent—but it is to wound the fellowship, to forfeit the sense of His comfort, to lose the joy of salvation, and to hinder His sanctifying work, much as sin between friends does not end the friendship but clouds it. The doctrine is therefore a powerful motive for holiness rooted in love rather than mere fear: the believer is restrained from sin not only by its consequences but by the thought of grieving the gracious Guest who indwells him. The remedy for a grieved Spirit is the confession and forsaking of the sin that caused the grief, and the restoration of glad communion with the One who will never leave.