In many books of the Bible there is found a key word that sets the theme of the writing. The key word in Phillipians epistle is "rejoice" (Phil. 4:4). The key word in Hebrews is, "better" Christ is better, superior and greater than any angel, priest or sacrifice (Heb. 1:3-5). The key word that often appears in the vision of Isaiah is "salvation." In fact Isaiah name means, "salvation of Jehovah." Here are the references in Isaiah where we read about God's salvation.
Wells of Salvation; "Therefore with joy shall ye draw water out of the wells of salvation" (Isa. 12:3).
Joy of salvation; "This is the LORD; we have waited for him, we will be glad and rejoice in his salvation" (Isa. 25:9).
Walls of salvation; "We have a strong city; salvation will God appoint for walls and bulwarks" (Isa. 26:1).
Everlasting salvation; "Israel shall be saved in the LORD with an everlasting salvation: ye shall not be ashamed nor confounded world without end" (Isa. 45:17).
Day of salvation; "In an acceptable time have I heard thee, and in a day of salvation have I helped thee" (Isa. 49:8).
Prophets of salvation; "How beautiful upon the mountains are the feet of him that bringeth good tidings, that publisheth peace; that bringeth good tidings of good, that publisheth salvation; that saith unto Zion, Thy God reigneth!" (Isa.52:7).
Spread of salvation; "The LORD hath made bare his holy arm in the eyes of all the nations; and all the ends of the earth shall see the salvation of our God" (Isa. 52:10).
The arm of salvation; "He saw that there was no man, and wondered that there was no intercessor: therefore his arm brought salvation unto him; and his righteousness, it sustained him" (Isa. 59:16).
The helmet of salvation; "For he put on righteousness as a breastplate, and an helmet of salvation upon his head" (Isa. 59:17).
The garments of salvation; "I will greatly rejoice in the LORD, my soul shall be joyful in my God; for he hath clothed me with the garments of salvation, he hath covered me with the robe of righteousness" (Isa. 61:10).
The light of salvation; "For Zion's sake will I not hold my peace, and for Jerusalem's sake I will not rest, until the righteousness thereof go forth as brightness, and the salvation thereof as a lamp that burneth" (Isa.62:1).
It seems most obvious that God gave Isaiah a vision of utmost and urgent importance. How shall we escape if we neglect so great salvation (Heb.2:4).