Final answer:
Jesus told Nathanael that he would see 'heaven opened, and the angels of God ascending and descending on the Son of Man', indicating greater revelations to come.
Step-by-step explanation:
When Nathanael declared his belief in Jesus because Jesus said, 'I saw you under the fig tree,' Jesus responded by saying that he would see greater things than these. Jesus told Nathanael, 'Truly, truly, I say to you, you will see heaven opened, and the angels of God ascending and descending on the Son of Man' (John 1:50-51). This reference recalls the story of Jacob's ladder from the Old Testament, implying that Jesus serves as the bridge between heaven and earth. This statement by Jesus was a promise to Nathanael that he would witness miraculous signs and have a deeper understanding of the spiritual realm through his relationship with Jesus.