4.  I blush so to write to you, for the men thus guilty are of my own blood; The allusion is supposed to be to Atarbius.  cf. Letter lxv. and I groan for my own soul, in that, like boxers fighting two men at once, I can only give the truth its proper force by hitting with my proofs, and knocking down, the errors of doctrine on the right and on the left.  On one side I am attacked by the Anomœan:  on the other by the Sabellian.  Do not, I implore you, pay any attention to these abominable and impotent sophisms.  Know that the name of Christ which is above every name is His being called Son of God, as Peter says, “There is none other name under heaven given among men, whereby we must be saved.” Acts iv. 12.  And as to the words “I came in my Father’s name,” it is to be understood that He so says describing His Father as origin and cause of Himself. cf. De Sp. S. § 44, p. 27.  And if it is said “Go and baptize in the name of the Father and of the Son and of the Holy Ghost,” we must not suppose that here one name is delivered to us.  For just as he who said Paul and Silvanus and Timothy mentioned three names, and coupled them one to the other by the word “and,” so He who spoke of the name of Father, Son, and Holy Ghost, mentioned three, and united them by the conjunction, teaching that with each name must be understood its own proper meaning; for the names mean things.  And no one gifted with even the smallest particle of intelligence doubts that the existence belonging to the things is peculiar and complete in itself.  For of Father, Son, and Holy Ghost there is the same nature and one Godhead; but these are different names, setting forth to a us the circumscription and exactitude of the meanings.  For unless the meaning of the distinctive qualities of each be unconfounded, it is impossible for the doxology to be adequately offered to Father, Son, and Holy Ghost.