Chapter 17.
129 So, then, all do not buy Christ at the same price; Photinus, who buys Him for death, buys Him at one price; the Arian, who buys Him to wrong Him, at another price; the Catholic, who buys Him to glorify Him, at another. But he buys Him without money according to that which is written: “He that has no money let him buy without price.”
130. “Not all,” says Christ, “that say unto Me, Lord, Lord, shall enter into the kingdom of heaven!” Although many call themselves Christians, and make use of the name, yet not all shall receive the reward. Both Cain offered sacrifice, and Judas received the kiss, but it was said to him, “Judas, do you betray the Son of Man with a kiss?” that is, you fill up your wickedness with the pledge of affection, and sowest hatred with the implement of peace, and inflictest death with the outward token of love.
131. Let not, then, the Arians flatter themselves with the employment of the name, because they call themselves Christians. The Lord will answer them: You set forward My Name, and deny My Substance, but I do not recognize My Name where My eternal Godhead is not. That is not My Name which is divided from the Father, and separated from the Spirit; I do not recognize My Name where I do not recognize My doctrine; I do not recognize My Name where I do not recognize My Spirit. For he knows not that he is comparing the Spirit of the Father to those servants whom He created. Concerning which point we have already spoken at length.
Source: On the Holy Spirit (New Advent)