The Spirit of God is in your heart, and it is very, very easy indeed to grieve him. Sin is as easy as it is wicked. You may grieve him by impure thoughts. He cannot bear sin. If you indulge in lascivious expressions, or even if you allow imagination to dote upon any lascivious act, or if your heart goes after covetousness, if you set your heart upon anything that is evil, the Spirit of God will be grieved, for thus I hear him speaking of himself. “I love this man, I want to have his heart, and yet he is entertaining these filthy lusts. His thoughts, instead of running after me, and after Christ, and after the Father, are running after the temptations that are in the world through lust.” And then his Spirit is grieved. He sorrows in his soul because he knows what sorrow these things must bring to our souls. We grieve him yet more if we indulge in outward acts of sin. Then is he sometimes so grieved that he takes his flight for a season, for the dove will not dwell in our hearts if we take loathsome carrion in there. A cleanly being is the dove, and we must not strew the place which the dove frequents with filth and mire; if we do he will fly elsewhere. If we commit sin, if we openly bring disgrace upon our religion, if we tempt others to go into iniquity by our evil example, it is not long before the Holy Spirit will be grieved. Again, if we neglect prayer; if our closet door is cobwebbed; if we forget to read the Scriptures; if the leaves of our Bible are almost stuck together by neglect; if we never seek to do any good in the world; if we live merely for ourselves and not for Christ, then the Holy Spirit will be grieved.
For meditation: If we are grieving the Spirit, it is absolutely impossible for us to obey the command to “be filled with the Spirit” (Ephesians 5:18).