Every wise man knows
To make time for both Work & Leisure.
But no more wise could be the wiser,
'Less first a fool exist.
'Wise' is an adjective. For it, or any adjective for that matter, to exist it relies solely and contingently on the existence of a contrast. For if all were wise, then all would be normal, and no man would ever be the wiser. Here, I play the fool because rather than understanding the wise man and his practices, I foolishly understood it to mean quite literally dress for work but be at a place of leisure. Perhaps a suit would have been more telling.
In any case, this contrast principal applies much to your eyes. Your vision is in constant reorientation in order to merely best process the images of light in front of you to, methodically, produce some sort of sense or image by stimulating AND inhibiting the reception of hundreds upon hundreds of stimuli..