Mark Booker - Galatians 4.4-7 - Trinity Sunday - This sermon, given on Trinity Sunday, reflects upon the doctrine of the Trinity and its relevance for our lives. In this passage, we see that we are adopted into the life of the triune God by the actions of the Father, the Son, and the Holy Spirit. That means we are brought into the eternal relationship of love that exists between the Father and the Son. Far from irrelevant, this doctrine is central to the gospel and leads us to joyful worship as we behold the mystery of the triune God.