(9) Dearly beloved, (10) I beseech [you] as strangers and pilgrims, (11) abstain from fleshly lusts, (12) which war against the soul;
(9) He returns to that general exhortation.
(10) A reason why we ought to live holy, that is, because we are citizens of heaven, and therefore we ought to live not according to the laws of this world, which is most corrupt, but of the heavenly city, although we are strangers in the world.
(11) Another argument: The children of God live not according to the flesh, that is, according to that corrupt nature, but according to the Spirit. Therefore fleshly actions should not rule us.
(12) The third argument: for although those lusts gratify us, yet they do not cease to fight against our salvation.