William Murray, 1st Earl of Mansfield Quote

As mathematical and absolute certainty is seldom to be attained in human affairs, reason and public utility require that judges and all mankind in forming their opinions of the truth of facts should be regulated by the superior number of the probabilities on the one side or the other whether the amount of these probabilities be expressed in words and arguments or by figures and numbers.

Reported in Andrew Stuart, Letters to the Right Honorable Lord Mansfield (1773), p. 29.