Therefore he who rejects doesn't reject man, but God, who has also given his Holy Spirit to you.
who hath also given unto us his holy Spirit: Some may rationalize evil behavior by saying, "I am just too weak to resist temptation." However, as the psalmist notes: "He knoweth our frame" (Psalms 103:14). God has made provision for our inadequacies, not the least of which is that He has "given unto us his Holy Spirit." The language here suggests this is a recurring gift. Immorality thus involves the third member of the Godhead because it is a sin against His continuing presence and is contrary to His holy nature.