Gregory of Nyssa

Joshua son of Nun made the Jordan River stop, but only as long as the ark was in the water. As soon as the people had crossed to the other side and the ark had come through, he gave the river back its usual flow again. The bottom of the deep in the Red Sea was denuded of water when the sea was driven back to either side by the Spirit, but the duration of the marvel was the passage of the army through the deep on the dry strip. But after that the surface of the sea became one again, and the temporary gap was flooded over. So this remains a unique event which occurred in such a way that the marvel did not lose credibility because of the passage of time, since it continues to be testified to by visible traces.

The people of the Hebrews, as we learn, after many sufferings, and after accomplishing their weary course in the desert, did not enter the land of promise until it had first been brought, with Joshua for its guide and the pilot of its life, to the passage of the Jordan. But it is clear that Joshua also, who set up the twelve stones in the stream, was anticipating the coming of the twelve disciples, the ministers of baptism.

For faithful is he who has promised that “a thousand shall be chased by one,” and that “ten thousand shall be put to flight by two,” victory in battle being due not to numbers but to righteousness.