9. unknown … yet well known—"unknown" in our true character to those who "evil report" of us, "well known" to those who hold us in "good report" (2Co 6:8). Conybeare explains, "Unknown by men, yet acknowledged by God" (1Co 13:12). Perhaps both God and men (believers) are intended as knowing him (2Co 5:11; 11:6).
dying … live—(2Co 1:9; 4:10, 11; 11:23). Compare Gaussen's remark, see on 2Co 6:5. "Behold" calls attention to the fact as something beyond all expectation.
chastened … not killed—realizing Ps 118:18.