Matthew 12:38

Could then anything be more foolish than these men (not more impious only), who after so many miracles, as though none had been wrought, say, "We would see a sign from Thee?" With what intent then did they so speak? That they might lay hold of Him again. For since by His words He had stopped their mouths, once and twice and often, and had checked their shameless tongue, they come to His works again. At which also the evangelist marvelling again, said, "Then certain of the scribes answered Him, asking a sign." "Then," when? When they ought to be stooping before Him, to admire, to be amazed and give way, "then" they desist not from their wickedness. And see their words too, teeming with flattery and dissimulation. For they thought to draw Him towards them in that way. And now they insult, now they flatter Him; now calling Him a demoniac, now again "Master," both out of an evil mind, how contrary soever the words they speak.

They require a sign of Him, as though what they had seen were not signs; and in another Evangelist what they required is more fully expressed, We would see of thee a sign from heaven. Either they would have fire from heaven as Elias did; or after the example of Samuel they would that in summer-time, contrary to the nature of the climate, thunder should be heard, lightnings gleam, and rain descend; as though they could not have spoken falsely even against such miracles, and said that they befel by reason of divers hidden motions in the air. For if thou cavillest against what thou not only beholdest with thine eyes, but feelest with thine hand, and reapest the benefit of, what wilt thou do in those things which come down from heaven. You might make answer, that in Egypt the magi also had given many signs from heaven.