'On Angels'

I have heard that voice many a time when asleep and, what is strange, I understood more or less an order or an appeal in an unearthly tongue:

All my life to pretend this world of theirs is mine And to know such pretending is disgraceful. But what can I do? Suppose I suddenly screamed And started to p…

They say somebody has invented you but to me this does not sound convincing for humans invented themselves as well.