Vincent's NT Word Studies
28. Lifted up. See on iii. 14.Ye shall know (gnwsesqe). Render, perceive, here as in ver. 27.
I am He. As in ver. 24, on which see note.
Of myself (ap emautou). Properly, from myself, as Rev., at vii. 17, but not here. See on vii. 17.
Hath taught (edidaxen). Rev., more correctly, taught. The aorist tense, regarding the teaching as a single act. Compare hkousa, I heard, iii. 32. I speak these things (pauta lalw). Not equivalent to so I speak (i.e., as the Father taught me), but an absolute declaration with reference to these present revelations.