It's a day to reflect on mystery. The Trinity is not totally outside our comprehension, although we can never fully reach the depths because it is supernatural, i.e., above nature. Our intellects are too small for it. Things in nature point to its reality and meaning, however. How can three persons be one?
Nature gives us a hint. For example a cell, the building block of life, has different elements that have different jobs. But it is only one cell. Atoms, which are even smaller, have, in fact, three basic element (with rare exceptions): protons, neutrons, and electrons.
