Meaning the salvation of Jah. The book of Isaiah, in its content concerning God’s eternal economy in Christ, is the leading book among all the books of the prophets. This book is the vision that Isaiah saw (v. 1), the word that Isaiah saw (Isa. 2:1), and the burden that Isaiah saw (Isa. 13:1; 15:1). The vision, word, and burden in Isaiah are concerned with God’s eternal economy in Christ, which is thoroughly covered in this book.
The book of Isaiah unveils that God’s dealing in love with His beloved Israel and His righteous judgment upon the nations bring in Christ, the Savior (Isa. 43:3; 49:26), who is God (Isa. 9:6) incarnated to be a man (Isa. 7:14), possessing both the divine nature and the human nature (Isa. 4:2), living on this earth (Isa. 53:2-3; 42:1-4), crucified (Isa. 53:7-10, 12), resurrected (Isa. 53:10-11), ascended (Isa. 52:13), and coming (Isa. 40:10; 64:1) to meet the need of God’s chosen people and the nations (Isa. 9:1-7; 49:6) in God’s all-inclusive salvation (Isa. 12:2-3), that the restoration of all things, of the created yet fallen universe (Isa. 2:2-5; 11:6-9; 35:1-10; 30:26), may be brought in, which will consummate in the new heaven and new earth for eternity (Isa. 65:17). Hence, the content of Isaiah covers God’s entire economy of the New Testament, from the incarnation (Matt. 1:18-25) to the new heaven and new earth (Rev. 21, Rev. 22), with the Old Testament background of God’s dealing with Israel and His judgment upon the nations. According to Isaiah’s prophecy, the Christ who was processed for the divine purposes is the centrality and universality of the great wheel of the move of the Divine Trinity (Ezek. 1:15 and note Ezek. 1:151a) for the accomplishing of His economy in the divine dispensing of Himself into His elect.