There used to be Reese’s commercials with two people crashing into each other. One had a chocolate bar, the other a jar of peanut butter. The result? A Reese’s Peanut Butter Cup.
It is fully chocolate, the chocolate does not get less chocolatey. It is fully peanut butter, the peanut butter does not become less peanut buttery.
Jesus was born of Mary – fully human. Jesus was conceived by the Holy Spirit so he is “God with us” – fully divine. He does not become less divine, nor does he become other than human. He is both.
A Reese’s lasts for a moment, Jesus lasts forever.