Mark 11:13

(ubi sup.) Just in the same way as He speaks parables, so also His deeds are parables; therefore He comes hungry to seek fruit off the fig tree, and though He knew the time of figs was not yet, He condemns it to perpetual barrenness, that He might show that the Jewish people could not be saved through the leaves, that is, the words of righteousness which it had, without fruit, that is, good works, but should be cut down and cast into the fire. Hungering therefore, that is, desiring the salvation of mankind, He saw the fig tree, which is, the Jewish people, having leaves, or, the words of the Law and the Prophets, and He sought upon it the fruit of good works, by teaching them, by rebuking them, by working miracles, and He found it not, and therefore condemned it. Do thou too, unless thou wouldest be condemned by Christ in the judgment, beware of being a barren tree, but rather offer to Christ the fruit of piety which He requires.

We may also say, in another sense, that the Lord sought for fruit on the fig tree before its time, and not finding it, cursed it, because all who fulfil the commandments of the Law, are said to bear fruit in their own time, as, for instance, that commandment, Thou shalt not commit adultery; but he who not only abstains from adultery but remains a virgin, which is a greater thing, excels them in virtue. But the Lord exacts from the perfect not only the observance of virtue, but also that they bear fruit over and above the commandments.

Wishing to show His disciples that if He chose He could in a moment exterminate those who were about to crucify Him. In a mystical sense, however, the Lord entered into the temple, but came out of it again, to show that He left it desolate, and open to the spoiler.