"You must follow the example of Joshua, the son of Nun, and carry the gospel as he carried the ark. Leave the desert, leave sin behind you to cross the river Jordan. Hurry to follow the way of Christ, to enter the land fertile with gladdening fruits and flowing with the promised milk and honey. All those things are symbols for us, all are prefigurations of realities now made visible."
Gregory of Nyssa (AD 330-395), Treastise on Baptism: PL 46, 417-421
Gregory was the younger brother of Basil the Great and bishop of Nyssa. He was the greatest speculative theologian of the three great Cappadocian Fathers.