A neighbor came to Nasrudin, asking to borrow his donkey. "It is out on loan," the teacher replied. At that moment, the donkey brayed loudly inside the stable. "But I can hear it bray, over there." "Whom do you believe," asked Nasrudin, "me or a donkey?"
-- old Sufi parable
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.