Lets start commentry as you asked so, start with first impression:
the moment i saw this was a short poem, i knew it was going to be an exprience worth having. In the first reading, it was clear poem was simple but i didn't got what you wanted to say.
Now lets talk about what are my thoughts?
first two para are really simple to understand since we all are familiar with this positive and negative. But, but, but
twist come in this poem in third para, these lines are simple but gives a shock. In first two para you are not on any side but suddenly you say this
though I guess that's half a glass more than someone with an empty glass.
these words give the idea that you are a optimist, you are looking at brighter side. You are comparing half glass with empty glass.
if we take things simply then are you trying to say, optimist OR pessimist thinking is better than NO ThINkING. If this is so I fully agree with you for i believe " for someone sitting on the top of the mountain, river flowing from right Or left direction doesn't matter.
I want to talk about the way you have written this piece. I was thinking why this poem suddenly turned, what caused the twist.
Well i think i have a answer: First two para's were in universal tune, i mean you were talking about universal truth, so every person was inculded. In third para you reduced universe to single person and that was you
If you ask me, either way you're
So the point is Dealing with universal psychology was simple but unfolding your psychology created twist.
Hope you write many more short poems and thanks for this one.