Prove to Me That Jesus Is Not a Created Being

Questions about why we should think Jesus is not a created being, and what it means to say God became fully human if part of being human means not being God.  

• Prove to me that Jesus is not a created being, that “begotten” doesn’t mean he was created, and that he has always existed.
• What does it mean to say God became fully human if part of being human means not being God?