The Things of God cannot be learned, they must be revealed.

St Catherine's Monastery is located at the foot of Mount Sinai (yes, that Mount Sinai) and is centuries old. The iconoclasts of the 9th century couldn't be bothered to go to this out of the way place, so many precious icons from the earliest times are preserved there.

Here is a photo of an encaustic icon of the Lord Jesus Christ preserved there:

See more here.