it's good

It's good that your magical mental creations go naturally and inevitably to an indefinite realm where they gradually dissolve into undefined light. In the end they will all dissolve completely into undefined light, and that's good. It's good that all your magical mental creations naturally and of their own accord go to an indefinite realm and dissolve into undefined light because it's good to be able to let go of things. Being able to do that makes you free.

It's not that you have to let go. You will eventually anyway, and if, at a given moment, you don't want to, you don't have to. Also, you can visit the indefinite realm, mentally, and you will find and can visit your magical mental creations there, maybe not all of them, who knows, but you will find them there. Eventually they will all dissolve into undefined light, but for a time, they reside there.