In Deuteronomy 20 we see the gospel preached by Moses to Israel as a picture of the blessed life we have in Jesus Christ.
Rev. Nutting brings God's word from the Psalms, and shows us how Psalm 131 describes a spiritual condition of the soul that is developed in us through out Lord Jesus Christ.
Like Israel, we need a mediator whose voice God has heard, and hears. We have that mediator in our Lord Jesus Christ.
God's servant must endure trouble by turning to, and trusting in, his God.
David calls out to the Lord God to be true to his own promises.