Mark 8:12

12 And he sighed deeply in his spirit, and saith, Why doth this generation seek for a sign? Verily I say to you, There shall no sign be given to this generation.

Mark 8:12 Meaning and Commentary

Mark 8:12

And he sighed deeply in his Spirit
In his human soul; and which shows that he had one, and was subject to grief and sorrow, and all passions and infirmities, excepting sin. This deep sigh was on account of the hardness of their hearts, the malignity of their minds, and insincerity of their intentions; who had no view to come at truth by this inquiry, but to ensnare him:

and saith, why doth this generation seek after a sign?
when so many have been shown among them, and they will not believe:

verily I say unto you, there shall no sign be given to this
generation:
such as they desired; namely, one from heaven. The Evangelist Matthew adds, "but the sign of the Prophet Jonas"; (See Gill on Matthew 16:4), (See Gill on Matthew 12:40).

Mark 8:12 In-Context

10 And forthwith he entered into a boat with his disciples, and came into the parts of Dalmanutha.

11 And the Pharisees came forth, and began to question with him, seeking from him a sign from heaven, tempting him.

12 And he sighed deeply in his spirit, and saith, Why doth this generation seek for a sign? Verily I say to you, There shall no sign be given to this generation.

13 And he left them, and entering into the boat again, departed to the other side.

14 Now [the disciples] had forgotten to take bread, neither had they in the boat with them more than one loaf.