The word impeccable means 'without sin'. As God is unknowable we are left with our nagual aspect. To be impeccable means to be without sin or to be in alignment with our nagual. For humans truth is not absolute. It is relative to our level of growth.
Truth has a purpose for that particular level of growth.
Often the purpose behind the truth is more important than the truth itself. A more accurate truth is that we don't create our own reality, our destiny has already been created by our nagual. But, to realise our destiny we must align our tonal to our nagual. Only we can do this. Our nagual will not do it for us.