“There is perhaps no passage in the entire Bible in which the personality of the Holy Spirit comes out more tenderly and touchingly than in Eph. iv. 30, “And grieve not the Holy Spirit of God, whereby ye are sealed unto the day of redemption.” Here grief is ascribed to the Holy Spirit. The Holy Spirit is not a blind, impersonal influence or power that comes into our lives to illuminate, sanctify and empower them. No, He is immeasurably more than that, He is a holy Person who comes to dwell in our hearts, One who sees clearly every act we perform, every word we speak, every thought we entertain, even the most fleeting fancy that is allowed to pass through our minds; and if there is anything in act, or word or deed that is impure, unholy, unkind, selfish, mean, petty or untrue, this infinitely holy One is deeply grieved by it. I know of no thought that will help one more than this to lead a holy life and to walk softly in the presence of the holy One. How often a young man is kept back from yielding to the temptations that surround young manhood by the thought that if he should yield to the temptation that now assails him, his holy mother might hear of it and would be grieved by it beyond expression. How often some young man has had his hand upon the door of some place of sin that he is about to enter and the thought has come to him, “If I should enter there, my mother might hear of it and it would nearly kill her,” and he has turned his back upon that door and gone away to lead a pure life, that he might not grieve his mother. But there is One who is holier than any mother, One who is more sensitive against sin than the purest woman who ever walked this earth, and who loves us as even no mother ever loved, and this One dwells in our hearts, if we are really Christians, and He sees every act we do by day or under cover of the night; He hears every word we utter in public or in private; He sees every thought we entertain, He beholds every fancy and imagination that is permitted even a momentary lodgment in our mind, and if there is anything unholy, impure, selfish, mean, petty, unkind, harsh, unjust, or in anywise evil in act or word or thought or fancy, He is grieved by it. If we will allow those words, “Grieve not the Holy Spirit of God,” to sink into our hearts and become the motto of our lives, they will keep us from many a sin.”
Torrey, R. A. (Reuben Archer). The Person and Work of The Holy Spirit . Kindle Edition.
On Faith and Writing 