The book of Joshua is an interesting book in the Old Testament. Moses has died, and the children of Israel are about to enter the promised land. Before they do so they must cross the Jordan river, but they have no way to cross. It is at this point that we must look at the power of God over nature. In Exodus the Lord parted the Red Sea so the Israelites could escape Pharaoh. In the book of Joshua God parted the Jordan River.
This can be read in Joshua 3:17 which states, “While all Israel were crossing over on dry ground, the priests who bore the ark of the covenant of the Lord stood on dry ground in the middle of the Jordan, until the entire nation finished crossing over the Jordan” (NRSV). Through baptism one parts the waters and is being led by the New Moses, which is Jesus Christ (Origen page 52). It is Christ, through his priesthood, that leads us into the future.
This is important for those of you who are being baptized. God has shown over and over what he can do in the natural realm. He parted the Red Sea, he provided manna from Heaven, and today He begins a new work in you. Through Baptism you step in the water, just as the twelve tribes did in the book of Joshua, and the waters part. You now follow the priests of Christ into the land of our inheritance (Origen page 53).
Through of your baptism you are dying and rising with Christ. This is a great responsibility, and a great honor. Christ is exalted when you come to the baptismal waters, and he is happy that you are here. Follow Christ and keep him close. Do not fall back into sin and be like the Egyptians who were swallowed up by the Red Sea.
Origen, et al. Homilies on Joshua. Catholic University of America Press, 2002. The Fathers of the Church.