TomS,
It was revealed, especially in the life of Christ. It is not only passed down to us by oral tradition, but also in writing by the Holy Fathers of the Church. Now I know you think the holy fathers were a bunch of goofs, but Orthodox Christians don't beleive this. So maybe we should just chalk this up as yet another difference between us?
Heres a joke: They said of Abba Pambo that his face never smiled. So one day, wishing to make him laugh, the demons stuck wing feathers on to a lump of wood and brought it in making an uproar and saying, “Go, go!” When he saw them, Abba Pambo began to laugh and the demons started to say in chorus, “Ha! Ha! Pambo has laughed!” But in reply he said to them, “I have not laughed, but I made fun of your powerlessness, because it takes so many of you to carry a wing.” Abba Pambo, from Sr. Benedicta Ward, “The Desert Christian,” (New York: MacMillan Publishing Co., Inc., 1975), pp. 195 - 198