Locke is careful to note that by “light of nature” he does not mean something like an “inward light” that is “implanted in man” and like a compass constantly leads human beings towards virtue. Rather, this light is to be understood as a kind of metaphor that indicates that truth can be attained by each of us individually by nothing more than the exercise of reason and the intellectual faculties ( Law , II: 123). Locke uses a comparison to precious metal mining to make this point clear. He acknowledges that some might say that his explanation of the discovery of the content of the law by the light of nature entails that everyone should always be in possession of the knowledge of this content. But, he notes, this is to take the light of nature as something that is stamped on the hearts on human beings, which is a mistake (see Law , III, 137-145). While the depths of the earth might contain veins of gold and silver, Locke says, this does not mean that everyone living on the stretch of land above those veins is rich ( Law , II: 135). Work must be done to dig out the precious metals in order to benefit from their value. Similarly, proper use must be made of the faculties we have in order to benefit from the certainty provided by the light of nature. Locke notes that we can come to know the law of nature, in a way, by tradition, which is to say by the testimony and instruction of other people. But it is a mistake to follow the law for any reason other than that we recognize its universal binding force. This can only be done by our own intellectual investigation ( Law , II: 129).
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