Passage
And he says to him, Verily, verily, I say to you, Henceforth ye shall see the heaven opened, and the angels of God ascending and descending on the Son of man.
And he says to him, Verily, verily, I say to you, Henceforth ye shall see the heaven opened, and the angels of God ascending and descending on the Son of man.
John 1:49 Nathanael answered and said to him, Rabbi, thou art the Son of God, thou art the King of Israel.
John 1:50 Jesus answered and said to him, Because I said to thee, I saw thee under the fig-tree, believest thou? Thou shalt see greater things than these.
John 1:51 And he says to him, Verily, verily, I say to you, Henceforth ye shall see the heaven opened, and the angels of God ascending and descending on the Son of man.
The verse centers on "says", "verily", "henceforth", "shall", "heaven", "opened", and "angels". It is saying that the verse draws attention to "says" and "verily", so its meaning should be read from those terms before moving to application.
The prior verse says "Jesus answered and said to him Because...", giving immediate footing for "says" and "verily". In John context, the local focus is the identity of Jesus, new birth, eternal life, and belief and unbelief.
A plain takeaway is to answer the verse's own emphasis on "says" and "verily" with trust shaped by these words, not by a vague optimism outside the passage.