Mark 8:12

12 And sighing deeply in spirit, he saith: Why doth this generation seek a sign? Amen, I say to you, a sign shall not 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 immediately going up into a ship with his disciples, he came into the parts of Dalmanutha.

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

12 And sighing deeply in spirit, he saith: Why doth this generation seek a sign? Amen, I say to you, a sign shall not be given to this generation.

13 And leaving them, he went up again into the ship and passed to the other side of the water.

14 And they forgot to take bread: and they had but one loaf with them in the ship.