:sleeping_2: "An evil and adulterous generation seeketh after a sign," is scripture.
Anyway seeking a sign, in effect, is saying I do not believe you. I need more evidence. Now granted the disciples on occasion asked for signs.
Matthew 24:3 And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? and what [shall be] the sign of thy coming, and of the end of the world?
John 20:24 But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.
:25 The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side, I will not believe.
But for the generation of Christ there was a sign given,
Isaiah 7:14 Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
Jesus further testifies to this in Luke,
Luke 11:29 And when the people were gathered thick together, he began to say, This is an evil generation: they seek a sign; and there shall no sign be given it, but the sign of Jonas the prophet.
:30 For as Jonas was a sign unto the Ninevites, so shall also the Son of man be to this generation.
The Son was the sign and that was enough.