John 19:34

There came out blood and water, which naturally could not come from a dead body. (Witham) --- Hence it is, that the sacred mysteries flow; as often, therefore, as thou approachest the awful cup, approach it as if thou wert going to drink from thy Saviour's sacred side. (St. John Chrysostom, hom. lxxxiv. in Joan.) --- The holy Fathers say, that the spouse [i.e. the Church] of Jesus Christ was here taken out of his side, whilst sleeping on the cross, as Eve was from Adam's side, when he was cast asleep in Paradise.