1 Cor. 9: 19-"Though I am free and belong to no man, I make myself a slave to everyone, to win as many as possible."
That, to me, is what this song means. We love being "free." We revel in the freedom that God has given us, and we declare that we will never be slaves again. This scripture says that he makes himself a slave to all men. He gives up who he is so that he can be who they need him to be, while still staying strong in Christ. This is impossible without God's eyes. Without seeing everyone around us the way Jesus saw them while He died on the cross, we could never love them enough. It's just amazing.