In each passage we see the Lord's power demonstrated. In the Psalm, it's in His voice. In 1 Samuel, it's in His help and protection from enemies. In Acts, it's in the completely changed life of Saul, and his bold teaching about Jesus.
How have you seen the power of The Lord in your own life?
Everliving God, whose will it is that all should come to you
through your Son Jesus Christ: Inspire our witness to him,
that all may know the power of his forgiveness and the hope of his resurrection; who lives and reigns with you and the Holy Spirit, one God, now and for ever.