In today's work environments, there is this illusion and pressure that you have to constantly perform on the very highest level at least eight hours a day. This is hurting so many people, up to the point where good folks drop out of their jobs due to burn-out and depression. So, it's important to recognize that we are all human after all and that the performance we are capable of is not constant. What we can deliver at work is depending on so many factors and many of them are actually outside of our control. We just have to accept that.