Divine Comedy
Inferno: Canto XI (5)
"Philosophy," he said, "to him who heeds it, Noteth, not only in one place alone, After what manner Nature takes her course From Intellect Divine, and from its art; And if thy Physics carefully thou notest, After not many pages shalt thou find, That this your art as far as possible Follows, as the disciple doth the master; So that your art is, as it were, God's grandchild. From these two, if thou bringest to thy mind Genesis at the beginning, it behoves Mankind to gain their life and to advance; And since the usurer takes another way, Nature herself and in her follower Disdains he, for elsewhere he puts his hope. But follow, now, as I would fain go on, For quivering are the Fishes on the horizon, And the Wain wholly over Caurus lies, And far beyond there we descend the crag."
Section XIII (1)
[Trismegistus] ’Tis in this way, Asclepius;—by mixing it, by means of subtle expositions, with divers sciences not easy to be grasped,—such as...
(1) [Trismegistus] ’Tis in this way, Asclepius;—by mixing it, by means of subtle expositions, with divers sciences not easy to be grasped,—such as arithmetic, and music, and geometry. But Pure Philosophy, which doth depend on godly piety alone, should only so far occupy itself with other arts, that it may [know how to] appreciate the working out in numbers of the fore-appointed stations of the stars when they return, and of the course of their procession. Let her, moreover, know how to appreciate the Earth’s dimensions, its qualities and quantities, the Water’s depths, the strength of Fire, and the effects and nature of all these. [And so] let her give worship and give praise unto the Art and Mind of God.
Chapter XIX: That the Philosophers Have Attained to Some Portion of Truth. (3)
"These, in my opinion, are none else than those who have philosophized right; to belong to whose number, I myself have left nothing undone in life,...
(3) "These, in my opinion, are none else than those who have philosophized right; to belong to whose number, I myself have left nothing undone in life, as far as I could, but have endeavoured in every way. Whether we have endeavoured rightly and achieved aught, we shall know when we have gone there, if God will, a little afterwards." Does he not then seem to declare from the Hebrew Scriptures the righteous man's hope, through faith, after death? And in Demodocus (if that is really the work of Plato): "And do not imagine that I call it philosophizing to spend life pottering about the arts, or learning many things, but something different; since I, at least, would consider this a disgrace." For he knew, I reckon, "that the knowledge of many things does not educate the mind," according to Heraclitus. And in the fifth book of the Republic. he says, "' Shall we then call all these, and the others which study such things, and those who apply themselves to the meaner arts, philosophers?' 'By no means,' I said, 'but like philosophers.' 'And whom,' said he, 'do you call true?' 'Those,' said I,' who delight in the contemplation of truth. For philosophy is not in geometry, with its postulates and hypotheses; nor in music, which is conjectural; nor in astronomy, crammed full of physical, fluid, and probable causes. But the knowledge of the good and truth itself are requisite, - what is good being one thing, and the ways to the good another.'" So that he does not allow that the curriculum of training suffices for the good, but co-operates in rousing and training the soul to intellectual objects. Whether, then, they say that the Greeks gave forth some utterances of the true philosophy by accident, it is the accident of a divine administration (for no one will, for the sake of the present argument with us, deify chance); or by good fortune, good fortune is not unforeseen. Or were one, on the other hand, to say that the Greeks possessed a natural conception of these things, we know the one Creator of nature; just as we also call righteousness natural; or that they had a common intellect, let us reflect who is its father, and what righteousness is in the mental economy.