No rational philosophical theory can be justified without Core Values. Values are an integral part of what we manifest as Reality. Philosophy is not just science — it is that and so much more. Philosophy helps us orient ourselves with respect to our values. Without Core Values, nothing matters.
So the first question is: What are your core values? The answer to this question, like your birth and your death, belong to you and you alone. Not even God can know or choose this for you. According to the myth of Genesis, God waits to see what your choices will be.
Once you have your core values, these are the axioms that you will apply your rational powers to achieve. How well you do this will determine how wise or how foolish you are. In the process you come to know the world and the world comes to know you.