The centre of reality? There is only one certainty to reality: COGITO ERGO SUM - I THINK THEREFORE I AM. You may have heard of it. Although modern philosophy makes a slight alteration: THERE ARE THOUGHTS THEREFORE THERE IS A THINKER.
Everything else is just a matter of belief, aside from a priori statements (which are ultimately only about the nature of language). 1+1 must equal 2 by definition. By definition, a batchelor must be an unmarried man. By definition, God cannot exist. All of these are tautologies.
A batchelor is defined as a male human who is not married to another human.