Gregory the Great — as excerpted in the Catena Aurea on Luke 13:6-9

“(Hom. 31. in Evang.) But our Lord came three times to the fig tree, because He sought after man’s nature before the law, under the law, and under grace, by waiting, admonishing, visiting; but yet He complains that for three years he found no fruit, for there are some wicked men whose hearts are neither corrected by the law of nature breathed into them, nor instructed by precepts, nor converted by the miracles of His incarnation.”