Don't be arrogant, because arrogance kills curiosity and passion.

Source: "Experiments That Point to a New Understanding of Cancer." TEDGlobal 2012. Jun. 2012. Conference Presentation. Additional Information: This quote means that you shouldn't be overly confident; if you are overly confident, you shut off your imagination and your drive to continue improving. Specifically, Bissell is discussing this idea in terms of making scientific discoveries. The quote is from Mina Bissell's TED Talk about revolutionary new experiments in the field of cancer research. Watch the full TED Talk here: Mina Bissell - Experiments That Point to a New Understanding of Cancer