De Agricultura

and I will destroy these things, and I will implant in those souls which are of a childlike age, young shoots, whose fruit shall nourish them. And those shoots are as follows: the practise of writing and reading with facility; an accurate study and investigation of

the works of wise poets; geometry, and a careful study of rhetorical speeches, and the whole course of encyclical education. And in those souls which have arrived at the age of puberty or of manhood, I will implant things which are even better and more perfect, namely, the tree of prudence, the tree of courage, the tree of temperance, the tree of justice, the tree of every respective virtue.