Commentaries:
Robertson's Word Pictures (NT)
Have I spoken (lelalhka). Perfect active indicative as in John 15:11; John 16:1. Solemn repetition.
When their hour is come (otan elqh h wra autwn). Indefinite temporal clause, otan with the second aorist active subjunctive of erxomai, "whenever their hour comes." The time appointed for these things.
Now that (oti). Simply "that" (declarative conjunction in indirect discourse. Forewarned is to be forearmed. Cf. John 13:19.
From the beginning (ec arxhv). As in John 6:64 but practically like ap arxhv in John 15:27. While Christ was with them, he was the object of attack (John 15:18).
Other Robertson's Word Pictures (NT) entries containing John 16:4:
John 6:64
John 7:33
John 8:25
John 13:19
John 15:20
1 John 1:1
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