Jesus does not need others to define who he is because he rests in the knowledge that he is called and beloved by God. Jesus does not need the man with the unclean spirit to proclaim that he is the “Holy One of God” (Mark 1:24) in order to own and live this identity for himself.
In the book of Genesis, after the changing of Jacob’s name to Israel, no one calls him by his new name. Instead, the name “Israel” seems to exist as his “true name” and Jacob as his “use name.” “Jacob” is the name that everyone calls him, but he knows that “Israel” is who he really is inside. God has named him “Israel,” and consequently, this will become his legacy.