I’ve wondered about this as well.
He was showing the human side of His nature ... emotion ...
After one moment, when I bowed my head
and the whole world turned over and came upright,
and I walked out where the old road shone white,
I walked the ways and heard what all men said...
The sages have a hundred maps to give
that track their crawling cosmos like a tree,
they rattle reason out through many a sieve
that stores the dust and lets the gold go free
and all these things are less than dust to me
because my name is Lazarus, and I live.
Yes, my name is Lazarus, and I live.
The Convert ~GK Chesterton
He wept over that lack of belief.