Tertullian Quote

We worship unity in trinity, and trinity in unity; neither confounding the person nor dividing the substance. There is one person of the Father, another of the Son, and another of the Holy Ghost; but the Godhead of the Father, and of the Son, and of the Holy Ghost, is all one; the glory equal, the majesty co-eternal.

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 285.