A poem to be remember retrospectively

Not ideal this, imagination.
Grasping earthly things of "humanism".
We can speak of reality,
.."Well, you might think so, but in reality I think you'll find that things are quite different"
-"What makes you think that? I think these thoughts, I am real, does it not follow that my thoughts are also."
"Well, yes"
-"So what I think...
"Let me finish! What you think is of the world, yes and in that sense there may be a germ of truth in it, but it is not in the world. - Thought is not a thing"
-"Is a thing a thought?"

Not idle, imagination this.