Ezekiel 16:63

that thou mayest remember and be confounded and never open thy mouth any more because of thy shame, all boasting on the part of man being excluded by the obvious deliverance by grace alone, when I am pacified toward thee for all that thou hast done, saith the Lord God. Thus the grace of God which has pardoned so many and so great sins is the one great subject of Gospel-preaching at all times. Nothing is so conducive to love and humility as the sense of the riches of God's pardoning grace.