16. we faint not—notwithstanding our sufferings. Resuming 2Co 4:1.
outward man—the body, the flesh.
perish—"is wearing away"; "is wasted away" by afflictions.
inward man—our spiritual and true being, the "life" which even in our mortal bodies (2Co 4:11) "manifests the life of Jesus."
is renewed—"is being renewed," namely, with fresh "grace" (2Co 4:15), and "faith" (2Co 4:13), and hope (2Co 4:17, 18).