John 11:9

Οὐχὶ … ἡμέρας, i.e., each man's day, or term of work, is a defined quantity. [τὰ δυώδεκα μέρεα τῆς ἡμέρης παρὰ Βαβυλωνίων ἔμαθον Ἐλληνες, Herod., ii. 109; and see Rawlinson's Appendix to his Translation.] ἐάν τις … βλέπει. So long as this day lasts, a man may go confidently forward to the duties that call him; οὐ προσκόπτει “he does not stumble,” he can walk erect and straight on amid dangers, cf. Matthew 4:6, “because he sees the light of the world”; as the sun makes all causes of stumbling manifest and saves the walker from them, so the knowledge of God's will, which is man's moral light, guides him; and to follow it is his only safety.