This idea of "..and I think we do our best work when we are conscious of both(success and failure)." has always intrigued me. Do we really need to know the real

This idea of "..and I think we do our best work when we are conscious of both(success and failure)." has always intrigued me. Do we really need to know the reality of failure? The explanation I can come up with is that the experience and knowledge of failure gives us an advantage on both sides of the 80-95% spectrum (lets ignore the validity of the numbers for a second). For the times when we feel that our chances our below 80% we get scared and if we had the experience of failure we would be better suited to handle the stress. On the 95% portion I think it keeps you honest by reminding you that you could fail and the consequences if you do.