When born-again believers continue to “conform to the ways of this world” (Romans 12:2) imagine how the Holy Spirit must feel! When we refuse to put off the former way of life but instead choose to embrace the old self that is being corrupted by its deceitful desires (Ephesians 4:22-24), would not the Spirit of truth (John 16:13) find our indulgences to be highly offensive? Would not being a first-hand witness to our unholiness grieve the Spirit who knows the dark mountains of chastisement and the lack of communion with God that we will suffer due to our refusal to put off the old self? Would not the complacency of those whom were bought at a price (1 Corinthians 6:20) grieve the Spirit who was present when the “perfector of our faith” (Hebrews 12:2) was mocked (Matthew 27:27-31), beaten, spit on and crucified on a tree (Matthew 27:27-31; John 19:1)? And would the Spirit be grieved knowing our sin keeps us from obtaining the fullness of Christ (Colossians 2:6-15) and the miraculous things (John 14:12-14) that we as His ambassadors (2 Corinthians 5:20) and royal priests (1 Peter 2:9) are enabled to perform? This sermon is going start by looking at the roles of the Sprit and finish with the causes of grieving Him.