8 These are not our own conjectures which we offer, nor do we falsely put together any of these things in order to deceive the ears of our hearers by perverting the meaning of words; but holding fast the form of sound teaching we know and preach the things which are true. For the Apostle shows that this unity of the faithful arises from the nature of the sacraments when he writes to the Galatians, For as many of you as were baptized into Christ did put on Christ. There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female; for you are all one in Christ Jesus. That these are one amid so great diversities of race, condition, sex—is it from an agreement of will or from the unity of the sacrament, since these have one baptism and have all put on one Christ? What, therefore, will a concord of minds avail here when they are one in that they have put on one Christ through the nature of one baptism?
Source: On the Trinity (New Advent)