John 16:28

"The promise of plain speech is now adumbrated in a terse utterance which is at once a summary of Johannine Christology and the heart of this Gospel." [Note: Beasley-Murray, p. 287.]

This was Jesus’ clearest statement yet about where He was going. What Jesus explained here should by now have become clear to the reader of this Gospel (cf. John 1:10-11; John 1:14; John 3:16-17; John 14:19). However to the disciples who first heard these words they were fresh, clear revelation. This statement really summarized Jesus’ mission from the Incarnation to the Ascension.