From the Ignite sessions at Velocity NY 2014 - http://velocityconf.com/velocityny2014/public/schedule/detail/37660
More info and video in a blog post: https://medium.com/@aneel/unicorns-and-the-language-of-otherness-eb5f2f9dd1c1
Because even in the face of overwhelming evidence, people will come up with excuses for why they should not, will not, can not—learn or change.