What do we gain from anything? Why do we exist? We are nothing but intelligent animals. We have two arms, two legs, and a head that is attached to our neck. We're biped creatures who managed to bang a couple of rocks together and conquered the earth. Our language has no meaning. It's simply drawings in a certain order that have a certain meaning. There is no such thing as truth. Truth is something that everyone believes is correct. It doesn't necessarily need to actually be the case. If everyone believed that the sky was purple, then the sky is in fact purple, because there is nothing that proves us wrong in that statement.