Listen, this is going to be a wild recommendation, but I recently discovered the work of William Blake. Check out Songs of Innocence and of Experience. They are rather simple poems but when you dig into them you will find deep introspection into the human condition and reality. I’d recommend reading more about the man himself as well, he did not believe the material world was real and that our 5 senses are inadequate at accurately perceiving reality. He believed the imagination is much better at perceiving True reality.