Isaiah 40:28

“Hast thou not known? hast thou not heard? &c.] From the history of the church in all ages; from the experience of all good men; from their own knowledge and observation; from the Scriptures, and the prophets, the interpreters of them; both that what is before suggested is wrong, and that what follows is true, that the everlasting God, the Lord, the Creator of the ends of the earth, fainteth not, neither is weary? or, “the God of the world”; that has made it, and upholds it, and governs it, and judges righteously in it; who is from everlasting to everlasting, unchangeably the same; whose name alone is Jehovah, the self-existent and all comprehending Being, the Maker and Former of all things;…”

“known--by thine own observation and reading of Scripture. heard--from tradition of the fathers. everlasting, &c.--These attributes of Jehovah ought to inspire His afflicted people with confidence. no searching of his understanding--therefore thy cause cannot, as thou sayest, escape His notice; though much in His ways is unsearchable, He cannot err (Job 11:7-9). He is never "faint" or "weary" with having the countless wants of His people ever before Him to attend to.”

“Hast thou not known? - This is the language of the prophet reproving them for complaining of being forsaken and assuring them that God was faithful to his promises. This argument of the prophet, which continues to the close of the chapter, comprises the main scope of the chapter, which is to induce them to put confidence in God, and to believe that he was able and willing to deliver them. The phrase, ‘Hast thou not known? refers to the fact that the Jewish people had had an abundant opportunity of learning, in their history, and from their fathers, the true character of God, and his entire ability to save them. No people had had so much light on this subject, and now that they were in trial,…”

“40:28 heard . . . understood: Cp. 40:21. • the everlasting God, the Creator of all the earth: Creation reveals God’s power and wisdom. He is also the Creator of the age to come, a world of righteousness, justice, and peace (45:8; 48:6-7; 65:17-18). • He never grows weak or weary: God is not susceptible to human limitations.”

“thou not known: Jer 4:22; Mar 8:17, Mar 8:18, Mar 9:19, Mar 16:14; Luk 24:25; Joh 14:9; Co1 6:3-5, Co1 6:9; Co1 6:16, Co1 6:19 the everlasting: Isa 57:15; Gen 21:33; Deu 33:27; Jer 10:10; Rom 16:26; Ti1 1:17; Heb 9:14 the ends: Isa 45:22, Isa 59:1; Sa1 2:10; Act 13:47 fainteth: Isa 66:9; Psa 138:8; Joh 5:17; Phi 1:6 no searching: Isa 55:8, Isa 55:9; Psa 139:6, Psa 147:5; Rom 11:33, Rom 11:34; Co1 2:16 Isaiah 40:29”

“The groundlessness of such despondency is set before them in a double question. "Is it not known to thee, or hast thou not heard, an eternal God is Jehovah, Creator of the ends of the earth: He fainteth not, neither becomes weary; His understanding is unsearchable." Those who are so desponding ought to know, if not from their own experience, at least from information that had been handed down, that Jehovah, who created the earth from one end to the other, so that even Babylonian was not beyond the range of His vision or the domain of His power, was an eternal God, i.e., a God eternally the same and never varying, who still possessed and manifested the power which He had displayed in the…”