10 Even once was Christ sacrificed for us, when we believed; then was thought; but now there are the remnants of thought, when we remember Who has come to us, and what He has forgiven us; by means of those very remnants of thought, that is, by means of the memory herself, He is daily so sacrificed for us, as if He were daily renewing us, that has renewed us by His first grace. For now the Lord has renewed us in Baptism, and we have become new men, in hope indeed rejoicing, in order that in tribulation we may be patient: nevertheless, there ought not to escape from our memory that which has been bestowed upon us. And if now your thought is not what it was—for the first thought was to depart from sin: but now thou dost not depart, but at that time departed—be there remnants of thought, lest He who has made whole escape from memory....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)