PETER. It befell me to be present when a certain brother was dying. As he was suddenly speaking, he breathed forth the breath of life; and him whom I had just before seen speaking with me, I saw of a sudden extinguished. But whether his soul departed or not, I did not see; and it seems very hard to believe a thing to be real which no one is able to see. GREGORY. What wonder, Peter, if you did not see the soul departing, which even while remaining in the body you do not see? Now while you speak with me, because you are unable to see my soul in me, do you therefore believe me to be lifeless? For the nature of the soul is invisible, and thus it departs from the body invisibly, just as it remains in the body invisibly.