Psalms 51:9

Hide Thy face from my sins, turning it away, in order not to see it any longer and thus be incited to new anger and punishment, and blot out all mine iniquities, removing from His presence not only those on whose account he was suffering so severely, but those of his whole life, for a Christian must ask for forgiveness again and again, during his whole life, up to the hour of his death. But it must be the cry of faith clinging to God's promises of mercy.