If it ever seems all is lost keep those neurons firing, keep trying things, and don't give up. Things you thought were insolvable problems might have a solution.
I have no category for this. This is in a category all it's own for which I do not have the words. Maybe Tam does. Planes are within her area of expertise and her skill with words exceeds mine by an order of magnitude or more.
H/T to Joe D. from an email list.