Although This May Seem A Paradox, All

Bertrand Russell

Although this may seem a paradox, all exact science is dominated by the idea of approximation. when a man tells you that he knows the exact truth about anything, you are safe in inferring that he is an inexact man. every careful measurement in science is always given with the probable error ... every observer admits that he is likely wrong, and knows about how much wrong he is likely to be.