After noting that the Synodical Letter is to be found in Theodoret and in Sozomen (i.e. is in Theodoret I. viii. and in Socrates I. ix.) the Ben. Ed. express surprise that Basil should indicate concurrence with the Synodical Letter, which defines the Son to be τῆς αὐτῆςὑποστασεως καὶ οὐσίας, while he is known to have taught the distinction between ὑπόστασις and οὐσία.  As a matter of fact, it is not in the Synodical Letter, but in the anathemas originally appended to the creed, that it is, not asserted that the Son is of the same, but, denied that He is of a different οὐσία or ὑπόστασις.  On the distinction between οὐσία and ὑπόστασις see Letters xxxviii., cxxv., and ccxxxvi. and the De Sp. Sancto. § 7.  On the difficulty of expressing the terms in Latin, cf. Letter ccxiv.  As ὑπόστασις was in 325 understood to be equivalent to οὐσία, and in 370 had acquired a different connotation, it would be no more difficult for Basil than for the Church now, to assent to what is called the Nicene position, while confessing three hypostases.  In Letter cxxv. Basil does indeed try to shew, but apparently without success, that to condemn the statement that He is of a different hypostasis is not equivalent to asserting Him to be of the same hypostasis.