If he emptied himself of it. Thessolonians.  He did not consider equality with God something to be grasped at.  

Logic, not revelation: if the Zarthons studying Earth in 25 AD had crash landed in Capernum with a dead engineer (and because they were time travelers knew about Jesus), could he have fixed their ship?  The correct answer is no.  He was a peasant Rabbi at that point, not a superman.  That means he could not have simply zapped them home either.  He might have offered a prayer, but that is it.  He might have even helped them get clothes and blend in, but no advanced tech.