Theophylact of Ohrid
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.
Our nature yields no fruit though three times sought for; once indeed when we transgressed the commandment in paradise; the second time, when they made the molten calf under the law; thirdly, when they rejected the Saviour. But that three years’ time must be understood to mean also the three ages of life, boyhood, manhood, and old age.