We do not dispense with clocks, because from time to time they go wrong, and tell untruly. A clock, organically considered, may be perfect, yet it may require regulating. Till that needful work is done, the moment-hand may mark the half-minute, when the minute-hand is at the quarter-past, and the hour hand is just at noon, and the quarter-bell strikes the three-quarters, and the hour-bell strikes four, while the sun-dial precisely tells two o'clock. The sense of certitude may be called the bell of the intellect; and that it strikes when it should not is a proof that the clock is out of order, no proof that the bell will be untrustworthy and useless, when it comes to us adjusted and regulated from the hands of the clock-maker.
[John Henry Newman, An Essay in Aid of a Grammar of Assent, Ch. VII, sect. 3.]