Q: (quoting me) "In other words, a philosophy or world view which does not contain a metaphysical reason to support the idea of Natural Reason does not have a necessary reason or justification to propose that we should feel pain when others feel pain." What do you mean here by a 'metaphysical reason', and what is meant by "Natural Reason" as opposed to just Reason? Do you mean by 'metaphysical reason' an assumed axiom or axioms which are the basis of the rest of a man's philosophy?
A: A metaphysical reason, in this context, means a reason supported by metaphysics, which is the study of the preconditions of other sciences.
For example, the belief that every effect comes from a cause is not a conclusions of physics; it is an axiom of physics but a conclusion of metaphysics. Physics properly so called cannot take place without it. Metaphysics can also be called the study of universals rather than particulars. Whether we live in a universe where the speed of light is absolute or relative is a matter of fact, determined by looking at the facts, and is a question of physics; whether or not all possible universes admit of the law of cause and effect is a question of metaphysics.
In the same way that the study of physics has axioms without which it cannot proceed, the study of ethics has also.
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