Nor any creatures would be able to know the full truth about any thing, this is simply because we only see and hear little about anything, therefore we are limited in this world, plus we have other human being who create the wrong imoression under the name of politics, power, money, entertainmant and many other reasons. However, the only one that knows the truth in full is god because he is the most knowledgable and god guide us to live in the most truthful way... yet we tend to rebel against the guidance of god.

Also we are in this life temporarily so there are alot fo reality covered from us, however, once we die we all start seeing the full truth and then we live in the permenant life.

Allah said to Adam when he took him from heaven "Then Adam received from his Lord [some] words, and He accepted his repentance. Indeed, it is He who is the Accepting of repentance, the Merciful. We said, "Go down from it, all of you. And when guidance comes to you from Me, whoever follows My guidance - there will be no fear concerning them, nor will they grieve."