How can you know for sure?

The author HL Mencken wrote: "the boring man is always sure, and the sure man is always boring." Results go hand in hand with uncertainty. The alert person notices imperfections, ambiguities and irregularities. He will explore them and complement them with his imagination, initiative and product. Chances of success live on the fringe where it is different. It resides next to the apart, between the extravagant and the outlandish. Contradiction, ambiguity and disorder are circumstances in which you must be able to settle. If you want to be successful, you have to think broadly and flexibly and be able to deal with complex and diverse ideas and not be sure. Sometimes, other times you will have to be. You choose.