He said to him, "Most assuredly, I tell you, hereafter you will see heaven opened, and the angels of God ascending and descending on the Son of Man."
In this conversation with Nathaniel, it is evident that Jesus intended the title "Son of man" to be understood in exactly the same sense as "Son of God."  This follows from the fact that, taking the conversation as a whole, the two titles are used synonymously and interchangeably, without any suggestion whatever that Christ rejected either "Son of God" or "King of Israel" as being properly applied to himself.  It is as though our Lord had said, "Yes, Nathaniel, you are correct; but for the present, let us use the title Son of man."