(The title for the song is the link to it.)
This hymn has been changed in various ways by various people. I’ll leave you to work out why I changed it the way I did. If you like it, feel free to use it!
This is a song about trusting that God cares — as indeed he does care for his people. It’s also about serving God in his strength. It talks about our relationship with God.
A song about our confidence that, as Paul says, because God has begun a good work in us, he will finish the job! It also reminds us that our standing before God is based on his mercy alone, not on any good things we do.