Gregory the Great
Catena Aurea · Lukasevangelium 13
He spake also this parable; A certain man had a fig tree planted in his vineyard; and he came and sought fruit thereon, and found none. Then said he unto the dresser of his vineyard, Behold, these three years I come seeking fruit on this fig tree, and find none; cut it down: why cumbereth it the ground? And he answering said unto him, Lord, let it alone this year also, till I shall dig about it, and dung it: And if it bear fruit, well: and if not, then after that thou shalt cut it down.
(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.