The second is divided into grammar, which makes one able to express; into logic, which makes one keen to argue; and into rhetoric, which makes one skilled at persuading or moving. And this likewise intimates the mystery of the most blessed Trinity.
The third is divided into monastic, economic, and political. And therefore the first intimates the innascibility of the First Principle, the second the familiarity of the Son, the third the liberality of the Holy Spirit.
All these sciences, moreover, have certain and infallible rules, like lights and rays descending from the eternal law into our mind. And therefore our mind, irradiated and suffused with such great splendors, unless it be blind, can be led through itself to the contemplation of that eternal light. The irradiation and consideration of this light suspends the wise in admiration, and on the contrary leads the foolish, who do not believe so that they may understand, into perturbation, so that that prophetic word may be fulfilled: Thou dost illumine wondrously from the eternal mountains; all the foolish of heart are troubled.