"It is to St. Jerome that we owe the earliest full and extant commentary on the book of Jonah. The saint composed it towards the end of the 4th century, in Bethlehem. He has no doubt but that Jonah, a type of Christ, is also a real person: indeed, in his preface, he asks that the prophet may bestow on him a renewed fervour, so that he may write as he ought. In several passages of the book, he notes certain characteristics of the historical Jonah, for example, his magnanimity in wanting to die, so that the crew of the ship should be saved. He distinguishes clearly what belongs to historia, the life and adventures of the prophet, from what belongs to tropologia, this same life as a prefigurement of the Saviour. In commenting on chapter two, he says:
“I am aware that some will be incredulous that a man should be preserved three days and three nights in the belly of a whale, to which the shipwreck had led him; these people are either believers or non-believers: if they are believers, they are obliged to believe much greater things.”
Among these ‘much greater things’, the saint lists the preservation of the three young men in the fiery furnace (Dan.3), and Daniel’s being preserved among the lions (Dan.14; Heb.11). One might also include any of the miracles of resurrection in either the Old or the New Testament.
St. Augustine argues similarly. In Epistle 102, written around 409 A.D., he is replying to a priest who had reported some objections to the Christian faith made by a mutual acquaintance of theirs, a pagan. Some of these objections, says St. Augustine, seem to stem from Porphyry, but the last, concerning the story of Jonah, and in particular his survival in the whale and the plant which miraculously sprang up over him, is presented as being a general matter of mockery among the pagans. In replying, the Bishop of Hippo says:
“Either all the divine miracles are to be disbelieved, or else there is no reason why this should not be believed. We should not believe in Christ Himself, and that He rose on the third day, if the faith of Christians feared the laughter of the pagans.”