Commentaries:
Robertson's Word Pictures (NT)
I go away, and I come (upagw kai erxomai), both futuristic presents (John 7:33; John 14:3, John 14:18).
If ye loved me (ei hgapate me). Second-class condition with the imperfect active of agapaw referring to present time, implying that the disciples are not loving Jesus as they should.
Ye would have rejoiced (exarhte an). Second aorist passive indicative of xairw with an, conclusion of second-class condition referring to past time, "Ye would already have rejoiced before this" at Christ's going to the Father (verse John 14:12).
Greater than I (meizwn mou). Ablative case mou after the comparative meizwn (from positive megav). The filial relation makes this necessary. Not a distinction in nature or essence (cf. John 10:30), but in rank in the Trinity. No Arianism or Unitarianism here. The very explanation here is proof of the deity of the Son (Dods).
Other Robertson's Word Pictures (NT) entries containing John 14:28:
John 5:18
John 7:33
John 13:1
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