39. When, however, a meaning is evolved of such a kind that what is doubtful
in it cannot be cleared up by indubitable evidence from Scripture, it remains
for us to make it clear by the evidence of reason. But this is a dangerous
practice. For it is far safer to walk by the light of Holy Scripture; so that
when we wish to examine the passages that are obscured by metaphorical
expressions, we may either obtain a meaning about which there is no
controversy, or if a controversy arises, may settle it by the application of
testimonies sought out in every portion of the same Scripture.