Dennis and Leah discussing the common tendency for salespeople to make assumptions about what potential customers are thinking during the sales process. They cover research showing people are generally poor at accurately determining others' thoughts, even with close friends and family. The hosts advise salespeople against guessing what customers are thinking and instead recommend asking direct questions to uncover true needs and perspectives. They explain cognitive biases like false consensus and confirmation bias that lead salespeople astray. Dennis argues curiosity is the most important sales trait for deeply understanding customer situations. They urge letting go of assumptions and certainty to have more effective sales conversations.