There is one art, of which every man should be master, the art of . If you are not a thinking man, to what purpose are you a man at all? In like mann… - Samuel Taylor Coleridge

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There is one art, of which every man should be master, the art of . If you are not a thinking man, to what purpose are you a man at all? In like manner, there is one knowledge, which it is in every man's interest and duty to acquire, namely, : or to what end was man alone, of all animals, endowed by the Creator with the faculty of self-consciousness?