Matthew 12:39

Wherefore also He rebukes them severely. And when they were questioning Him roughly and insulting Him, He reasoned with them gently; when they were flattering; reproachfully, and with great severity; implying that He is superior to either passion, and is neither at the one time moved to anger, nor at the other softened by flattery. And see His reproach, that it is not merely hard words, but contains a demonstration of their wickedness. For what saith He? "An evil and adulterous generation seeketh after a sign." Now what He saith is to this effect: What marvel if ye behave so to me who have been hitherto unknown to you when even to the Father, of whom ye have had so much experience, ye have done the very same? forsaking Him, ye have run unto the devils, drawing to yourselves wicked lovers. With this Ezekiel too was continually upbraiding them. Now by these sayings He signified Himself to be of one accord with His Father, and them to be doing nothing new; He was also unfolding their secrets, how with hypocrisy and as enemies they were making their demand. Therefore He called them "an evil generation," because they have been always ungrateful towards their benefactors; because upon favors they become worse, which belongs to extreme wickedness. And He called it "adulterous," declaring both their former and their present unbelief; whereby He implies Himself again to be equal to the Father, if at least the not believing Him makes it "adulterous." Then, after His reproach, what saith He? "There shall no sign be given to it, but the sign of Jonas the prophet." Now is He striking the first note of the doctrine of His resurrection, and confirming it by the type. What then? one may say; was no sign given it? None was given to it on asking. For not to bring in them did He work His signs (for He knew them to be hardened), but in order to amend others. Either then this may be said, or that they were not to receive such a sign as that was. For a sign did befall them, when by their own punishment they learnt His power. Here then He speaks as threatening, and with this very meaning obscurely conveyed: as if He said, innumerable benefits have I showed forth, none of these hath drawn you to me, neither were ye willing to adore my power. Ye shall know therefore my might by the contrary tokens, when ye shall see your city cast down to the ground, the walls also dismantled, the temple become a ruin; when ye shall be cast out both from your former citizenship and freedom, and shall again go about everywhere, houseless and in exile. (For all these things came to pass after the cross.) These things therefore shall be to you for great signs. And indeed it is an exceeding great sign, that their ills remain unchanged; that although ten thousand have attempted it, no one hath been able to reverse the judgment once gone forth against them.

This is the sign which before He had promised to give them when they asked it, saying, "An evil and adulterous generation seeketh after a sign, and there shall no sign be given to it, but the sign of the prophet Jonas;" meaning His cross, and His death, His burial, and His resurrection. And again, declaring in another way the virtue of the cross, He said, "When ye have lifted up the Son of Man, then shall ye know that I am He." And what He saith is to this purport: "When ye have crucified me, and think ye have overcome me, then, above all, shall ye know my might." For after the crucifixion, the city was destroyed, and the Jewish state came to an end, they fell away from their polity and their freedom, the gospel flourished, the word was spread abroad to the ends of the world; both sea and land, both the inhabited earth and the desert perpetually proclaim its power.

Excellently is that said, and adulterous, seeing she has put away her husband, and, according to Ezekiel, has joined herself to many lovers.

Then He begins to answer them, giving them a sign not from heaven, which they were unworthy to see, but giving it them from the deep beneath. But to His own disciples He gave a sign from heaven, to whom He showed the glory of His blessed eternity both in a figure on the mount, and after in verity when He was taken up into heaven. Wherefore it follows, And there shall no sign he given it, but the sign of the Prophet Jonas.