One and the same exhortation does not suit all. For the things that profit some often hurt others; seeing that also for the most part herbs which nourish some animals are fatal to others; and the medicine which abates one disease aggravates another; and the food which invigorates the life of the strong kills little children.

Therefore according to the quality of the hearers ought the discourse of teachers be fashioned, so as to suit all and each for their several needs, and yet never deviate from the art of common edification. Every teacher also, that he may edify all in the one virtue of charity, ought to touch the hearts of his hearers out of one doctrine, but not with one and the same exhortation.