Carl Sagan wrote: the absence of evidence is not the evidence of absence.
That is, our inability to perceive or discover a thing must never be taken as proof that it doesn’t exist.
It’s always possible that the thing we’re looking for is beyond our current ability to imagine, understand, or detect. Furthermore, the failure to find what we’re looking for can also be an indicator that we haven’t searched for a long enough time or that we’re looking in the wrong places.
Sagan made his statement within the context of scientific inquiry. Today, I’d like to give it a philosophical and psychological application as well:
The inability to see goodness, beauty, or value in the people or events that surround us does not prove that goodness, beauty, and value are absent.
If you can’t see any evidence in your life for being positive, that’s okay. As long as you don’t equate the absence of evidence with the evidence of absence, you’ll always have a chance at discovering something interesting.
Whatever you do, don’t close your mind to the possibility of other possibilities.
Where optimism fails, an open mind succeeds.
At least that’s the way I see it.