This is a song by Brenton Brown written using Isaiah's words that those who wait upon the Lord shall rise up on the wings of eagles.
The song also embraces the prophet's (and God's) desire for justice for those in need--the weak and poor. For me, these needy and weak persons can be both us and those who are poor in other ways. In both cases our salvation is tied up together--in helping save others lives (not simply 'souls' but a more holistic salvation) through mission and service and evangelism we also receive God's salvation.
more thoughts at jmcbray.wordpress.com