The Triad has a special beauty and fairness beyond all numbers, primarily because it is the very first to make actual the potentiality of the Monad - oddness, perfection, proportionality, unification, limit.
"The Theology of Arithmetic". Translated by Robin Waterfield in "The Theology of Arithmetic: On the Mystical, Mathematical and Cosmological Symbolism of the First Ten Numbers", 1988.
