Because though all sins are forgiven in baptism, not as yet is the weakness of this fleshly substance made strong. For we rejoice at the overwhelming of the Egyptians having now crossed the Red sea, but in the wilderness of worldly living there meet us other foes, who, the grace of Christ directing us, may by our exertions be subdued until we come to our own country.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).