Thinking about "Positive Thinking"

I just heard someone refers the concept of positive thinking as an irrational optimism. And then I realized how much the term has been abused (or not). I don't know how the masses understand "positive thinking" nowadays. But after a bit of contemplating, I think this is what the term really means (maybe it has been said, I don't know). Anyways, in my understanding, being positive is not equivalent to being optimistic. Being positive is to love. On the flip side, being negative is to fear. Some examples below:

My Religion is Legit = Yours is Not?

Saying one religion is better than others is like saying a M-size shirt is better than a L-size shirt.

Thought

Where does it come from?

Could it be told with words?

If so, what is delivering those words?

Who is there to comprehend?

They say a picture is worth a thousand words.

But could a thousand pictures convey a thought?

Thoughts come in and out of my mind as they please.  And I (if there's such a thing) am left speechless...