Wherefore with all fear and a pure conscience and certain faith let us draw near and it will assuredly be to us as we believe, doubting nothing. Let us pay homage to it in all purity both of soul and body: for it is twofold. Let us draw near to it with an ardent desire, and with our hands held in the form of the cross let us receive the body of the Crucified One: and let us apply our eyes and lips and brows and partake of the divine coal, in order that the fire of the longing, that is in us, with the additional heat derived from the coal may utterly consume our sins and illumine our hearts, and that we may be inflamed and deified by the participation in the divine fire. Isaiah saw the coal. But coal is not plain wood but wood united with fire: in like manner also the bread of the communion is not plain bread but bread united with divinity. But a body which is united with divinity is not one nature, but has one nature belonging to the body and another belonging to the divinity that is united to it,
John Damascene. “An Exact Exposition of the Orthodox Faith.” In St. Hilary of Poitiers, John of Damascus, edited by Philip Schaff and Henry Wace, translated by S. D. F. Salmond, 9b:83. A Select Library of the Nicene and Post-Nicene Fathers of the Christian Church, Second Series. New York: Christian Literature Company, 1899.