Mateus 18
Bede
Mateus 18:12
[(as quoted by Aquinas, AD 1274)] (ap. Anselm.)f; Or, By the ninety-nine sheep, which He left on the mountains, are signified the proud to whom a unit is still wanting for perfection. When then He has found the sinner, He rejoices over him, that is, He makes his own to rejoice over him, rather than over the false righteous. — Catena Aurea by Aquinas
Mateus 18:13
[(as quoted by Aquinas, AD 1274)] (ap. Anselm.) The Lord found the sheep when He restored man, and over that sheep that is found there is more joy in heaven than over the ninety and nine, because there is a greater matter for thanksgiving to God in the restoration of man than in the creation of the Angels. Wonderfully are the Angels made, but more wonderfully man restored. — Catena Aurea by Aquinas