In modern day belief systems, Quantum Mechanics has replaced
  Trinity belief as "most complicated thing for humans". Compare:
  "Anyone who claims to understand quantum theory is either lying
  or crazy," -Richard Feynmann
  "anyone who tries to understand the Trinity loses his mind"
  Augustine But of course, there _are_ people who understand
  Trinity throughout history and there _are_ people who understand
  Quantum theory. Yet they both maintain this mystique, one from
  20th century quantum theory and one from .. oh, at least 150AD -
  present, so about 20 centuries. The early Church hotly debated
  Trinity doctrine, just as we debate Quantum theory today. There
  may be an 18 century span (1800 years) between the debates, but
  to me, it's the same level of attempting to clarify with
  precision concepts that involve a combination of subjective and
  objective, participation and observation, in a system that is
  both timeless yet under continual, ceaseless change that's only
  loosely predictable in the larger picture, but seems to
  disappear in clarity when one gets to the "how many angels at
  the head of a pin?" or "how many possible states in an open
  Universe across the span of Time?" So, is this an unfair
  comparison? If so, why so? If it seems more or less correct,
  why? And more importantly than my questions, what are your
  thoughts? [which is also a question*tongue emoticon*]