To Don't

This piece from Lao Tzu causes me to wonder if we might not benefit from spending as much time creating our "to don't" lists as we spend creating our to do lists.  

The uses of not

Thirty spokes
meet the hub.
Where the wheel isn’t
is where it’s useful.

Hollowed out,
clay makes a pot. 
Where the pot’s not 
is where it’s useful.

Cut doors and windows 
to make a room.
Where the room isn’t, 
there’s room for you.

So the profit in what is
is in the use of what isn’t.
--Lao Tzu