From the Quotation of the day mailing list, 2013-06-19:
"Toleration is historically the product of the realization of the irreconcilability of equally dogmatic faiths, and the practical improbability of complete victory of one over the other. Those who wished to survive realized that they had to tolerate error. They gradually came to see merits in diversity, and so became skeptical about definitive solutions in human affairs." -- Isaiah Berlin
(submitted to the mailing list by Terry Labach)