Augustine of Hippo — as excerpted in the Catena Aurea on Matthew 13:44

“(Quæst. in Ev. i. 13.) Or, He speaks of the two testaments in the Church, which, when any hath attained to a partial understanding of, he perceives how great things lie hid there, and goeth and selleth all that he hath, and buyeth that; that is, by despising temporal things he purchases to himself peace, that he may be rich in the knowledge of God.”