According to the celestial multiplication table, once one is three, and three times 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 is equal to himself and the other two. Nothing ever was, nothing ever can be more perfectly idiotic and absurd than the dogma of the Trinity.

The Works of Robert G. Ingersoll: Lectures (ed. 1900)