And He said to him, “Truly, truly, I say to you, you will see the heavens opened and the angels of God ascending and descending on the Son of Man.” [John 1:51]
When I first read this verse my understanding was Jesus was telling His disciples that He, the Son of Man, would link heaven (God) and earth (Man), giving them a preview of the near future. Recently an article I read pointed out that the above verse was in reference to the dream Jacob had.
He had a dream, and behold, a ladder was set on the earth with its top reaching to heaven; and behold, the angels of God were ascending and descending on it. [Genesis 28:12]
When I checked the commentaries, some attempt to link the 2 verses, some do not. If the 2 verses are linked, then Jesus was also telling His disciples that He would fulfil the dream, or prophecy, Jacob had. Even if the 2 verses are not linked, i.e. Jesus was not referring to the dream, or prophecy, Jacob had, it does not change the fact that the ladder Jacob saw in his dream is a symbol of Christ, and Jesus has become that ladder, linking the heaven and earth, through His work on the cross.