Commentaries:
Robertson's Word Pictures (NT)
They were willing therefore (hqelon oun). Inchoative imperfect, "they began to be willing." This does not contradict Mark 6:51 as Bernard thinks. Both Jesus and Peter climbed into the boat.
Whither they were going (eiv hn uphgon). Progressive imperfect active, "to which land they had been going" (intransitive use of upagw, to lead under, to go under or away as in verse John 6:67; John 7:33; John 12:11; John 18:8.
Other Robertson's Word Pictures (NT) entries containing John 6:21:
John 7:33
John 11:8
John 21:8
2 John 1:10
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