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 Reid for making the Common Sense in its integrity the necessary criterion of philosophy, he claimed for himself the special credit of distinguishing its necessities as of two sorts—the one a positive power, the other the impotence implied in finite intelligence. Hence human experience rests on a conditioned, or (so far) paralysed intelligence; and if omniscience only can be called 'knowledge,' while to know 'in part,' therefore with involved mysteries, must be called ignorance—it follows that man knows nothing. Ignorance is then the consummation of human philosophy, and its highest attainment is this discovery. 'Our dream of knowledge is a little light rounded with darkness.' 'The highest reach of science and philosophy is the scientific recognition of human ignorance.' 'Doubt is the beginning and the end of all our efforts to know.' 'The last and highest consecration of all true religion is an altar to the unknown and unknowable God.' Man’s knowledge of existence must be relative to his limited experience and intelligence.

The missionary of a neglected truth is apt to be one-sided and even paradoxical, and strenuous expression was natural to Hamilton. From his first essay in 1829 to his last in 1855 he sought to show the inconsistency of infinite knowledge with our limited share of inspiration in the Common Sense. Accordingly, the negative and incomplete, or what Bacon calls 'broken' character of man’s knowledge, rather than its positive victories, is ever supreme in the Hamiltonianised Reid, along with a recast of Reid's account of the Common Sense as involved in perception of the outward things of sense.

The respective offices of Reid and Hamilton might be compared in this aphorism of Pascal—'La Nature soutient