So what was his sermon about, did he quote scripture?
He opened with forgiveness, and not being consumed by bitterness, etc. That often it is the act of faith in God and his command to forgive that we are able to forgive. The message was mostly on doing the will of God. Doing what God wants you to do... some are teachers, preachers, etc. It was about entering into God's rest and peace by being in His will.