Jesus sighed deeply in His spirit and said, “Why does this generation demand a sign? Truly I tell you, no sign will be given to this generation.”
Mark 8:12. And groaning in his spirit. By these words Mark informs us that it occasioned grief and bitter vexation to our Lord, when he saw those ungrateful men obstinately resist God. And certainly all who are desirous to promote the glory of God, and who feel concern about the salvation of men, ought to have such feelings that nothing would inflict on their hearts...
Still Christ is upon motion; now he visits the parts of Dalmanutha, that no corner of the land of Israel might say that they had not had his presence with them. He came thither by ship (Mar 8:10); but, meeting with occasions of dispute there, and not with opportunities of doing good, he entered into the ship again (Mar 8:13), and came back. In these verses, we are told, I.
Commenting on Mark 8:10-21
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...