William Kingdon Clifford
An English mathematician and philosopher, a Victorian Briton whose most famous philosophical work is an essay written nearly 150 years ago.
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"No real belief, however trifling and fragmentary it may seem, is ever truly insignificant; it prepares us to receive more of its like, confirms those which resembled it before, and weakens others; and so gradually it lays a stealthy train in our inmost thoughts, which may someday explode into overt action, and leave its stamp upon our character."
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"It is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence."