Every real object has three dimensions. All are essential and none is less essential than any other. Similarly, an equilateral triangle (one with three equal sides) has three equal lines and all are necessary to form the triangle. Finalloy, consider the quantum world. We cannot imagine how something can be both a particle and a wave. It is too far outsode our human experience. Neither can we imagine three Persons in one Being. I am not a theologian, but I suspect that the Trinity is a sort of metaphor for something even more mysterious.