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we knew what was right and wrong. We cling to our point of view, as though everything depended on it. And yet our opinions have no permanence: like autumn and winter, they gradually pass away.. ,"2 "Perfect is the man who knows what conies from heaven (spiritual knowledge/wisdom) and what conies from man (wordly knowledge/science). Knowing what comes from heaven, he is in tune with heaven. Knowing what comes from man, he uses his knowledge of the known to develop his knowledge of the unknown and enjoys the fullness of life until his natural death. This is the perfection of knowledge. However, there is one diffi culty. Knowledge must be based upon something, but one is not certain what this may be. How, indeed, do I know what I call heaven is not actually man, and that what I call man is not actually heaven? First, there must be a true man; then there can be true knowledge".3

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