It is a life that we can start to enjoy today. It is a life that we can enjoy in its fullness in glory for eternity as we worship and serve God in his presence with all the others saints. Now a slave has no permanent place in the family, but a son belongs to it forever. So if the Son sets you free, you will be free indeed. The idea of being a slave in our civilisation is foreign.
People recoil against it.
But people who are up to their ears in debt because their eyes are bigger than their wallets are enslaved by the materialistic culture in which we live. The middle letter in the word sin is 'I'. So I am at the centre of sin. That is the definition of sin. Putting myself before God and other people.