Isaiah
Isaiah 40:28ESV·traditional attribution

Have you not known? Have you not heard? The LORD is the everlasting God, the Creator of the ends of the earth. He does not faint or grow weary; his understanding is unsearchable.

John Calvin Reformed @genevareformer

28. Hast thou not known? He repeats the same statement which he had formerly made, that the people who had been carefully taught in the school of God were inexcusable for their slothfulness, and chides them sharply for not having profited more by the doctrine of the Law, and by the other means which God had bestowed in addition to that knowledge which they possessed in common with the Gentiles.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. The prophet reproves the people of God, who are now supposed to be captives in Babylon for their unbelief and distrust of God, and the dejections and despondencies of their spirit under their affliction (Isa 40:27): "Why sayest thou, O Jacob! to thyself and to those about thee, My way is hidden from the Lord?

Commenting on Isaiah 40:27-31

John Gill Reformed Baptist @doctorgill

He giveth power to the faint,.... Who are ready to faint under afflictions, because they have not immediate deliverance, or their prayers are not answered at once, or promises not fulfilled as they expected; to such he gives fresh supplies of spiritual strength; he strengthens their faith, and enlarges their views, to behold the goodness of the Lord in the land of the living, and...