We may believe what goes beyond our experience, only when it is
inferred from that experience by the assumption that what we do not
know is like what we know.
We may believe the statement of another person, when there is
reasonable ground for supposing that he knows the matter of which he
speaks, and that he is speaking the truth so far as he knows it.
It is wrong in all cases to believe on insufficient evidence; and
where it is presumption to doubt and to investigate, there it is
worse than presumption to believe.