Pride is an unusual emotion in that everyone should have some of it but having too much can be dangerous. This hour, we’ll explore how pride can push us to great achievements – and make us do terrible things in the process – with University of British Columbia psychology professor Jessica Tracy. She writes about the pluses and minuses of pride in “Take Pride: Why the Deadliest Sin Holds the Secret to Human Success” (Houghton Mifflin Harcourt).