The pruning-hook is made, certainly, principally for pruning; but with it we separate twigs that have got intertwined, cut the thorns which grow along with the vines, which it is not very easy to reach. And all these things have a reference to pruning. Again, man is made principally for the knowledge of God; but he also measures land, practises agriculture, and philosophizes; of which pursuits, one conduces to life, another to living well, a third to the study of the things which are capable of demonstration. Further, let those who say that philosophy took its rise from the devil know this, that the Scripture says that “the devil is transformed into an angel of light.”[1018] When about to do what? Plainly, when about to prophesy. But if he prophesies as an angel of light, he will speak what is true. And if he prophesies what is angelical, and of the light, then he prophesies what is beneficial when he is transformed according to the likeness of the operation, though he be different with respect to the matter of apostasy. For how could he deceive any one, without drawing the lover of knowledge into fellowship, and so drawing him afterwards into falsehood? Especially he will be found to know the truth, if not so as to comprehend it, yet so as not to be unacquainted with it. Philosophy is not then false, though the thief and the liar speak truth, through a transformation of operation. Nor is sentence of condemnation to be pronounced ignorantly against what is said, on account of him who says it (which also is to be kept in view, in the case of those who are now alleged to prophesy); but what is said must be looked at, to see if it keep by the truth. And in general terms, we shall not err in alleging that all things necessary and profitable for life came to us from God, and that philosophy more especially was given to the Greeks, as a covenant peculiar to them--being, as it is, a stepping-stone to the philosophy which is according to Christ--although those who applied themselves to the philosophy of the Greeks shut their ears voluntarily to the truth, despising the voice of Barbarians, or also dreading the danger suspended over the believer, by the laws of the state.