He had said above that the tower of virtue was not only to be begun, but also to be completed, and to this belongs the following, Salt is good. It is a good thing to season the secrets of the heart with the salt of spiritual wisdom, nay with the Apostles to become the salt of the earth. (Matt. 5:14.) For salt in substance consists of water and air, having a slight mixture of earth, but it dries up the fluent nature of corrupt bodies so as to preserve them from decay. Fitly then He compares His disciples to salt, inasmuch as they are regenerated by water and the Spirit; and as living altogether spiritually and not according to the flesh, they after the manner of salt change the corrupt life of men who live on the earth, and by their own virtuous lives delight and season their followers.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).