The Main Reason Common Sense Fails Is Because We Take It For Granted We can see in the rearview mirror that smoking is really bad, but we do it anyway. Every time we fail, it’s because we ignored the obvious. Common sense is prince of all knowledge data bases. Applying it is the pauper of all data bases. Insight: King of all common sense is common practice. Hindsight really is 20/20. Next Blog By jeff noel Retired Disney Institute Keynote Speaker and Prolific Blogger. Five daily, differently-themed personal blogs (about life's 5 big choices) on five interconnected sites. View all of jeff noel's posts.