To redeem means to buy back that which no longer belongs to you. It may previously belonged to you but you are no longer the owner. In the context of our study lesson it refers to our Heavenly Father rescuing mankind from incarceration in the prison house of Satan by paying the ultimate price of His Son Jesus Christ dying for our pardon and the right to bring us to God’s kingdom of grace, freedom, joy, light, peace and grace. Our Lord Jesus’ blood was spilt in sacrificing Himself for all humanity. The devil had chained us to sin for eternity and we were powerless to save ourselves. We cannot make claim to anything we did/do of our own to save ourselves but must remain eternally indebted to God Almighty.
Source: Daily Sabbath School Lessons