Translated by W. Moore and H. A. Wilson
Ye that are strong with all might in the inner man ought by rights to carry on the struggle against the enemies of the truth, and not to shrink from the task, that we fathers may be gladdened by the noble toil of our sons; for this is the prompting of the law of nature: but as you turn your ranks, and send against us the assaults of those darts which are hurled by the opponents of the truth, and demand that their "hot burning coals"  and their shafts sharpened by knowledge falsely so called should be quenched with the shield of faith by us old men, we accept your command, and make ourselves an example of obedience  , in order that you may yourself give us the just requital on like commands, Ablabius, noble soldier of Christ, if we should ever summon you to such a contest.
In truth, the question you propound to us is no small one, nor such that but small harm will follow if it meets with insufficient treatment. For by the force of the question, we are at first sight compelled to accept one or other of two erroneous opinions, and either to say "there are three Gods," which is unlawful, or not to acknowledge the Godhead of the Son and the Holy Spirit, which is impious and absurd.
The argument which you state is something like this:--Peter, James, and John, being in one human nature, are called three men: and there is no absurdity in describing those who are united in nature, if they are more than one, by the plural number of the name derived from their nature. If, then, in the above case, custom admits this, and no one forbids us to speak of those who are two as two, or those who are more than two as three, how is it that in the case of our statements of the mysteries of the Faith, though confessing the Three Persons, and acknowledging no difference of nature between them, we are in some sense at variance with our confession, when we say that the Godhead of the Father and of the Son and of the Holy Ghost is one, and yet forbid men to say "there are three Gods"? The question is, as I said, very difficult to deal with: yet, if we should be able to find anything that may give support to the uncertainty of our mind, so that it may no longer totter and waver in this monstrous dilemma, it would be well: on the other hand, even if our reasoning be found unequal to the problem, we must keep for ever, firm and unmoved, the tradition which we received by succession from the fathers, and seek from the Lord the reason which is the advocate of our faith: and if this be found by any of those endowed with grace, we must give thanks to Him who bestowed the grace; but if not, we shall none the less, on those points which have been determined, hold our faith unchangeably.
 Ps. cxx. 3; the phrase is rendered in A.V. by "coals of juniper," in the Vulg. by "carbonibus desolatoriis."
 Reading, with Oehler, eupeitheias
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Reference address : http://www.elpenor.org/nyssa/not-three-gods.asp