Scientists think they can comprehend the big and small universes and teach others; Ecclesiastical leaders believe that they can be faithful and encourage others; Philosophers contemplate their navels; And the everyday person is just trying to make it day by day.
With each new scientific discovery more there are more questions than answers. With every moral victory the realization that end is not in sight. With each philosophical statement a chorus of dissent and disagreement. And with the end of each day we hope that we can get through the next.
For me the glass is half empty because I do not see from which the source is to fill it up. The physical world is unknowable and God is silent.