It is somewhat easy to teach about an object. However, the absolute truth is not an object. So, it is not possible to show it. There are many methods that are developed to take the seeker towards the absolute truth. Since these are just methods to lead one towards the truth and these methods are trying to speak of something that cannot be objectified, they may have apparent contradictions. After the Self Realisation, the methods need to be dropped.
For example sake, let us consider the use of the word witness when talking about the Self. The word witness is a nice pointer, but strictly speaking there is an element of duality hidden in it. If there is a witness, there is something to witness, i.e. duality. Pure awareness means there is nothing else but it, no duality. The seer and the scenery merge. Thus, the word witness is a pointer helping a seeker to separate the Self from the non-Self (body & unsteady mind). This pointer becomes useless from the perspective of Self.