I believe shutting up about what you believe is a way to stay close-minded, a way not to be busted. If you have some crazy thought and keep it in your head, there is much less chance that someone will say, 'what are you, fucking nuts?' One of the quickest ways to find out if you are wrong is to state what you believe.

—Penn Jillette

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The tale of the Trojan Horse might be apocryphal – no one knows – but it stands out as one of military history’s most famous cautionary tales about yielding to unexamined beliefs. The story goes that the Greeks, frustrated by years of waging an unsuccessful siege on the walled city of Troy, built a massive wooden horse, left it at the city gates as a parting “gift” to their putative victors, and pretended to sail home. Ignoring the naysayers (most famously, the prophet Cassandra and the priest Laocoön, both of whom warned their fellow Trojans that the gift was a trap), Troy’s leaders brought the horse inside the city walls. That night, thirty-odd soldiers who had been concealed inside crept out and opened the gates to the returned Greek army. The Greeks destroyed the city and slaughtered its citizens, thereby ending – and winning – the Trojan War.