Irenaeus Against Heresies Book I Some passages, also, which occur in the Gospels, receive from them a colouring of the same kind, such as the answer which He gave His mother when He was twelve years of age: "Wist ye not that I must be about My Father's business? "[258] Tertullian Against Praxeas business? "[368] Infancy Thomas Greek A And Jesus said to them: Why do you seek me? Do you not know that I must be about my Father's business?[21]