“For the LORD GOD is my strength and my song, and he has become my salvation” (v2). God had already demonstrated His saving power to the Israelites by miraculously leading them out of Egypt, yet Isaiah prophesied that the Lord would “become” Israel’s salvation in a more complete way in the future. “In that day” (v1), the Messiah would bring God’s reign to earth, and “with joy you will draw water from the wells of salvation” forever (v3). Knowing this wonderful promise, the prophet said, “I will trust and not be afraid” (v2).
“Make known His deeds among the peoples … in all the earth” (v4-5). God’s great salvation in Jesus deserves to be made known to everyone.