And Jacob dreamed that there was a ladder set up on the earth, and the top of it reached to heaven; and behold, the angels of God were ascending and descending on it! And behold, the LORD stood above it and said, "I am the LORD, the God of Abraham your father and the God of Isaac. (Genesis 28:12-13b)
And Jesus said to Nathanael, "Truly, truly, I say to you, you will see heaven opened, and the angels of God ascending and descending upon the Son of man." (John 1:50-51)
Jesus, as the Son of man, reveals himself as Jacob's ladder. It is the humanity of Christ that is the ladder, that which joins heaven to earth.
Christian life and spirituality is a finding of ourselves, day by day, in that sacred humanity of Christ, so that we may also say of our own humanity, with Jacob, "Surely the Lord is in this place; and I did not know it." (Genesis 28:16) It is a discovery of who we truly were all along, a humanity made sharer in the infinite love and creativity of God by the death and resurrection of Jesus Christ.
Christ is the way and the door. Christ is the ladder and the vehicle. (St. Bonaventure)