24 If the Arians agree with Dionysius let them use his language.
These things Arius either never heard, or heard and in his ignorance did not understand. For otherwise, had he understood, he would not have so grossly libelled the Bishop, but certainly would revile him also, as he did ourselves, because of his hatred of the truth. For being an adversary of Christ, he will not hesitate to persecute also those who hold the doctrine of Christ, as the Lord Himself has said beforehand: 'If they persecuted Me, they will also persecute you'. Or, if the leaders of impiety think Dionysius was a partisan of theirs, let them write and confess what he did. Let them write about the vine and the husbandman, the boat and the shipbuilder; and let them at the same time confess, as he did in his defence, the Unity of Essence, and that the Son is of the Father's Substance, and eternal; and the relation of intelligence and word, and the well and the river, and the rest; in order that they may see from the very contrast that he used the former class of language for a special purpose, but the latter as expressing the full meaning of the Christian Faith. And consequently let them, by adopting this language, revoke what they have held inconsistently with it. For in what way does the faith of Dionysius even approximate to the mischief of Arius? Does not Arius restrict the term Word to a conceptual sense, while Dionysius calls Him the true Word of God by nature? And while the one banishes the Word from the Father, the other teaches that He is the Father's own, and inseparable from His Essence, as the word is to the intelligence and the river to the well. If then any one is able to separate and banish the word from the intelligence, or to put asunder the river and the well, and wall them off, or to say that the river is of another essence than the well, and to show that the water is from elsewhere, or ventures to divide the brightness from the light and to say that the brightness is from another essence, then let him join Arius in his madness. For such an one will cease to have the semblance even of human intelligence. But if Nature knows that these are indivisible, and that the offspring of those objects is their very own, then let no one any longer hold with Arius or slander Dionysius, but rather on these grounds admire the plainness of his language and the correctness of his faith.
Source: De Sententia Dionysii (New Advent)