It is impossible to agree with Zingerle (Comment. Wölfflin. p. 218) that Hilary was under the necessity of using a Greek and Latin Glossary. Such a passage as Tract. in Ps. cxxxviii. 43, to which he appeals, shows rather the extent than the smallness of Hilary’s knowledge of Greek. What he frankly confesses, there as elsewhere, is ignorance of Hebrew. The words of Jerome (Ep. 34, 3 f.) about Hilary’s friend, the presbyter Heliodorus, to whom he used to refer for explanations of Origen on the Psalms, are equally incapable of being employed to prove Hilary’s defective Greek. Heliodorus knew Hebrew, and Hilary for want of Hebrew found Origen’s notes on the Hebrew text difficult to understand, and for this reason, according to Jerome, used to consult his friend; not because he was unfamiliar with Greek.