They Will Shine Like Lightning

For as the body of the Lord was glorified when he climbed the mount and was transfigured into the divine glory and into infinite light, so also the bodies of the saints are glorified and shine like lightning. Just as the interior glory of Christ covered his body and shone completely, in the same way also in the saints the interior power of Christ in them in the day will be poured out exteriorly upon their bodies. For even now at this time they are in their minds participators of his substance and nature. For it is written: "He that sanctifies and the one who is sanctified are of one" (Heb. 2:11); and: "The glory that you have given me, I have given them" (Jn 17:22). Similarly, as many lamps are lighted from the one, same fire, so also it is necessary that the bodies of the saints, which are members of Christ, become the same which Christ himself is.

—(Pseudo-)Macarius,Homily 15:38 (circa 390)