Sing unto the Lord - This is the same expression which occurs in the song of Moses Exodus 15:21. Isaiah evidently had that in his eye.
He hath done excellent things - Things that are exalted (גאות gê'ûth ); that are worthy to be celebrated, and had in remembrance; things that are majestic, grand, and wonderful.
This is known in all the earth - Or, more properly, ‹Let this be known in all the earth.‘ It is worthy of being celebrated everywhere. It should be sounded abroad through all lands. This expresses the sincere desire of all who are redeemed, and who are made sensible of the goodness and mercy of God the Saviour. The instinctive and the unceasing wish is, that the wonders of the plan of redeeming mercy should be everywhere known among the nations, and that all flesh should see the salvation of our God.
Many were to behold the One altogether lovely, the chiefest among ten thousand. “Thine eyes shall see the King in His beauty,” was the gracious promise made them. Isaiah 33:17. Their sins were to be forgiven, and they were to make their boast in God alone. In that glad day of redemption from idolatry they would exclaim, “The glorious Lord will be unto us a place of broad rivers and streams.... The Lord is our judge, the Lord is our lawgiver, the Lord is our king; He will save us.” Verses 21, 22. PK 321.1
The messages borne by Isaiah to those who chose to turn from their evil ways were full of comfort and encouragement. Hear the word of the Lord through His prophet: PK 321.2
“Remember these, O Jacob and Israel;
For thou art My servant:
I have formed thee; thou art My servant:
O Israel, thou shalt not be forgotten of Me.
I have blotted out, as a thick cloud, thy transgressions,
And, as a cloud, thy sins:
Return unto Me; for I have redeemed thee.” PK 321.3