The Seal of the Holy Spirit – Assurance of Salvation
Pastor Tan Thai · Oct 6, 2013
This sermon, based on Ephesians 1:13-14, explains the significance of the Holy Spirit's seal as the certain guarantee of a believer's salvation. The pastor uses the image of Andrew asking Jesus 'Where do you stay?' to introduce the question of where the Holy Spirit dwells in a believer's life.
The sermon opens with the story of Andrew and another disciple of John the Baptist following Jesus and asking 'Where are you staying?' (John 1:36-39). The pastor analyzes that this question was not about finding a street address, but about wanting to know who Jesus was, how He lived, and what His daily life looked like. After spending the day with Jesus, Andrew immediately went to find his brother Simon Peter and declared 'We have found the Messiah.' The pastor uses this to introduce the parallel question about the Holy Spirit: 'Where does He dwell?'
The second section focuses on the dwelling place of the Holy Spirit. Drawing from Isaiah 57:15 and 2 Corinthians 1:21-22, the pastor affirms that the Holy Spirit — the Third Person of the Trinity — willingly takes up residence in the heart of a believer, even though the human heart is a place filled with deceit, sin, and corruption as confirmed in Jeremiah 17:9. Just as Jesus was born in a manger (Philippians 2:6-8), the Holy Spirit humbly enters the sinful heart to cleanse, purify, and renew it. The pastor uses the image of a house with many rooms to illustrate that the Holy Spirit desires to be Lord over and clean out every room in one's life, not just the visible, presentable ones.
The third section explains the theological significance of the sealing of the Holy Spirit based on Ephesians 1:13-14. The pastor emphasizes that God not only stamps a seal but also secures it completely, pointing to two key truths: the certain assurance of salvation and God's lordship over the believer's life. The pastor contrasts a Catholic bishop's view — that final salvation depends on the state of the soul at death — with the biblical position as expressed in Romans 8:1-2 and Romans 8:35-39.
The pastor concludes that the assurance of salvation is not a license to sin freely, nor does it depend on the state of one's soul at death. Rather, it rests on God's promise and the believer's response to the Holy Spirit's work of renewal. When a believer sins, they do not lose the Holy Spirit but they do lose intimate fellowship with Him — just as a dirty house does not need to be demolished but cleaned. The Holy Spirit keeps, protects, and strengthens God's people through every circumstance of life.