We demonstrate the power of the Holy Spirit in our lives by walking and living in the Spirit. It manifests in the "fruit of the Spirit". This fruit is acutally singular which is LOVE. Love then manifests in 8 different ways. Joy, peace, longsuffering, gentleness, goodness, faithfulness, meekness and self-control. This is the power that love has in our lives. Paul, all through Galatians, is emphasizing the central message of the true gospel. It's not in the keeping of the law, which no one can do, but in living in the grace of God. Paul uses father Abraham as our challenge to faith. He believed God's promise to him and became the father of all who believe. And the final seed of Abraham was Jesus Christ. This was the fulfillment of Abraham's promised blessing. In Christ, the Father said, all the nations would be blessed. And everyone what believe's God, by faith, is of the seed of Abraham. So Abraham's seed is not a race, but "Faith".