The document discusses how great ideas often fail to spread due to "the BIG funnel" - a selection process that allows only a few ideas to spread widely. It notes that some ideas fail due to bored audiences, poor timing, flawed execution, fear of failure, laziness, hesitation, or a belief that someone else could do it better. However, if an idea has already failed once but the creator is willing to try again and again to make it happen, it can still spread. The document encourages spreading good ideas and not letting them fail.