“But to what shall I compare this generation? It is like children sitting in the market places, who call out to the other children, and say, ‘We played the flute for you, and you did not dance; we sang a dirge, and you did not mourn.’ For John came neither eating nor drinking, and they say, ‘He has a demon!’ The Son of Man came eating and drinking, and they say, ‘Behold, a gluttonous man and a drunkard, a friend of tax collectors and sinners!’ Yet wisdom is vindicated by her deeds.”
— Matthew 11:16-19
The men of Nineveh will stand up with this generation at the judgment, and will condemn it because they repented at the preaching of Jonah; and behold, something greater than Jonah is here.
— Matthew 12:41
Then it goes and takes along with it seven other spirits more wicked than itself, and they go in and live there; and the last state of that man becomes worse than the first. That is the way it will also be with this evil generation.”
— Matthew 12:45
And Jesus answered and said, “You unbelieving and perverted generation, how long shall I be with you? How long shall I put up with you? Bring him here to Me.”
— Matthew 17:17
Sighing deeply in His spirit, He said, “Why does this generation seek for a sign? Truly I say to you, no sign will be given to this generation.”
— Mark 8:12
For whoever is ashamed of Me and My words in this adulterous and sinful generation, the Son of Man will also be ashamed of him when He comes in the glory of His Father with the holy angels.”
— Mark 8:38
And He answered them and said, “O unbelieving generation, how long shall I be with you? How long shall I put up with you? Bring him to Me!”
— Mark 9:19
Etc.
All of these have to do with the generation to whom He is speaking.