The illusion of the glass being 1/2 full or 1/2 empty is the same illusion of separation for the divine source, God, Creator or Great Spirit. It is the vessel that is important and how it can be used. Francisco E. Alvarez 2016

Thirty spokes share the wheel’s hub;
It is the center hole that makes it useful.
Shape clay into a vessel;
It is the space within that makes it useful.
Cut doors and windows for a room;
It is the holes which make it useful.
Therefore profit comes from what is there;
Usefulness from what is not there.

Tao de Ching