‘For we who live are always delivered unto death for Jesus' sake, that the life also of Jesus may be manifested in our mortal flesh.'
There is now a swift movement from ‘dying' to spiritual ‘dying' (compare 2 Corinthians 1:9 with 2 Corinthians 1:10). Through their experiences ‘we who live', that is have spiritual life in Him, are ‘delivered to death'. They are given the opportunity to die to self and sin, to die daily, and this is for Jesus' sake (compare 2 Corinthians 5:14). This significance is demanded by the phrase that follows. And the purpose is so that the life of Jesus may be openly revealed in their mortal flesh, that they may be revealed as alive in Him, and he alive in them, that Christ might be seen in them (compare Galatians 2:20; Romans 6:4; Philippians 3:10-11). Their self dies that their ‘life' might shine through.
Note the reference to ‘mortal flesh'. The body is weak and could die at any time, and yet through it is manifested the life of the risen Jesus, which will continue on when the body in its fleshly form is there no more.