John 1:51

“And he saith unto him, verily, verily, I say unto you, etc.] Not only to Nathanael, but to the rest of the disciples that were then with him; and to show himself to be the “Amen”, and faithful witness, as well as more strongly to asseverate what he was about to say, he doubles the expression: hereafter you shall see heaven open; either in a literal sense, as it had been at his baptism; or, in a mystical sense, that there should be a clearer manifestation of heavenly truths made by his ministry; and that the way into the holiest of all should be made more manifest; and a more familiar intercourse he opened between God and his people; and also between angels and saints: and the angels of God…”

“Hereafter, &c.--The key to this great saying is Jacob's vision (Gen 28:12-22), to which the allusion plainly is. To show the patriarch that though alone and friendless on earth his interests were busying all heaven, he was made to see "heaven opened and the angels of God ascending and descending upon a" mystic "ladder reaching from heaven to earth." "By and by," says Jesus here, "ye shall see this communication between heaven and earth thrown wide open, and the Son of man the real Ladder of this intercourse." Next: John Chapter 2”

“Verily, verily - In the Greek, “Amen, amen.” The word “amen” means “truly, certainly, so be it” - from the Hebrew verb to confirm, to establish, to be true. It is often used in this gospel. When repeated it expresses the speaker’s sense of the importance of what he is saying, and the “certainty” that it is as he affirms. Ye shall see - Not, perhaps, with the bodily eyes, but you shall have “evidence” that it is so. The thing shall take place, and you shall be a witness of it. Heaven open - This is a figurative expression, denoting “the conferring of favors.” Psalms 78:23-24; “he opened the doors of heaven, and had rained down manna.” It also denotes that God was about to work a miracle in…”

“Hereafter ye shall see - All of these, as well as thou, who believe on me now in my state of humiliation, shall hereafter see me come in my glory, and all the angels of God with me. This seems the most natural sense of the words, though they may also refer to his ascension. Next: John Chapter 2”

“1:51 I tell you the truth (Greek amēn amēn): Jesus often used this expression to emphasize what he was about to say. In John’s Gospel, the Greek word amēn is always doubled. • you will all see heaven open: Jesus made the comparison with Jacob explicit (see study note on 1:47; see Gen 28:10-22). Like Jacob, Nathanael would see God at work. Jesus himself is the new Bethel (“house of God,” Gen 28:19), the place where God lives. • Son of Man: See study note on John 9:35; see also Dan 7:13-14; Mark 8:31. • John the apostle used several names for Jesus (Son of God, Son of Man, Messiah). Knowing Jesus’ true identity is necessary to fully understanding and following him.”

“Verily: Joh 3:3, Joh 3:5, Joh 5:19, Joh 5:24, Joh 5:25, Joh 6:26, Joh 6:32, Joh 6:47, Joh 6:53, Joh 8:34, Joh 8:51, Joh 8:58, Joh 10:1, Joh 10:7, Joh 12:24, Joh 13:16; Joh 13:20, Joh 13:21, Joh 13:38, Joh 14:12, Joh 16:20, Joh 16:23, Joh 21:18 Hereafter: Eze 1:1; Mat 3:16; Mar 1:10; Luk 3:21; Act 7:56, Act 10:11; Rev 4:1, Rev 19:11 and the: Gen 28:12; Dan 7:9, Dan 7:10; Mat 4:11; Luk 2:9, Luk 2:13, Luk 22:43, Luk 24:4; Act 1:10, Act 1:11; Th2 1:7-9; Ti1 3:16; Heb 1:14; Jde 1:14 the Son: Joh 3:13, Joh 3:14, Joh 5:27, Joh 12:23, Joh 12:24; Dan 7:13, Dan 7:14; Zac 13:7; Mat 9:6, Mat 16:13-16; Mat 16:27, Mat 16:28, Mat 25:31, Mat 26:24; Mar 14:62; Luk 22:69 Next: John Chapter 2”