Commentaries:
Robertson's Word Pictures (NT)
When ye have lifted up the Son of man (otan uywshte ton uion tou anqrwpou). Indefinite temporal clause with otan (ote + an) and the first aorist active subjunctive of uyow, to lift up (Koin‚ verb from uyov, height), used several times in John of the Cross of Christ (John 3:14; John 8:28; John 12:32, John 12:34). It is unnecessary to render the aorist subjunctive as if a future perfect, simply "whenever ye lift up" (actually lift up, ingressive aorist). In Acts 2:33 the verb is used of the Ascension.
Shall ye know (gnwsesqe). Future (ingressive aoristic) middle of ginwskw. Cognoscetis ex re quod nunc ex verbo non creditis (Bengel). But the knowledge from the facts like the fall of Jerusalem will come too late and will not bring a change of heart. The Holy Spirit will convict them concerning judgment (John 16:8). For
I am (egw eimi) see on verse John 8:24.
As the Father taught me (Kaqwv edidasken me o pathr). This claim Jesus repeats (see verse John 8:26) and clearly makes on his arrival at the feast (John 7:16 f.). This fact marks Jesus off from the rabbis.
Other Robertson's Word Pictures (NT) entries containing John 8:28:
John 3:14
John 5:19
John 5:30
John 7:6
John 7:28
John 8:24
John 8:28
John 8:58
John 12:32
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