16 Dec Regression to the mean
The mean is the average as in our average day. When things are going poorly (below the mean), best to be calm as they are likely to get better and regress back to the mean. In calmness we’re less distracted by our mind and more likely to make the most of what comes next; that will bring us back to or above the mean. We calm down when we remember that however difficult our current circumstances, they could be worse; so we have much for which to be grateful.
When our circumstances are much better than average, best to be anxious as the good times are unlikely to continue forever; at some point they’ll regress to the mean or lower. Low levels of anxiety allow us to imagine (and thereby see before they occur) negative events which often precipitate the regression; thus allowing us the chance to avoid or minimize the affect of those events.