A man can wear out a particular part of...

A man can wear out a particular part of his mind by continually using it and tiring it: but the tired parts of the mind can be rested and strengthened not merely by rest, but by using other parts… Many men have found great advantage in practicing a handicraft for pleasure. Joinery, chemistry, bookbinding, even bricklaying—if one were interested in them and skillful at them—would give relief to the overtired brain.