Robert Ingersoll on the Trinity:
Christ, according to the faith, is the second person in the Trinity, the Father being the first and the Holy Ghost third. Each of these persons is God. Christ is his own father and his own son. The Holy Ghost is neither father nor son, but both. The son was begotten by the father, but existed before he was begotten–just the same before as after. Christ is just as old as his father, and the father is just as young as his son. The Holy Ghost proceeded from the Father and Son, but was equal to the Father and Son before he proceeded, that is to say, before he existed, but he is of the same age as the other two. So it is declared that the Father is God, and the Son and the Holy Ghost God, and these three Gods make one God. According to the celestial multiplication table, once one is three, and three time one is one, and according to heavenly subtraction if we take two from three, three are left. The addition is equally peculiar: if we add two to one we have but one. Each one equal to himself and to the other two. Nothing ever was, nothing ever can be more perfectly idiotic and absurd than the dogma of the Trinity.