If you are really wondering what this teaching is all about, it can be put simply as a case of mistaken identity. What is at the crux of the quest for the Truth is not so much about the nature of Truth. It is all about your identity. Yes, your identity. This identity of yourself that you so much believe in and are convinced of its authenticity. This identity that you have a name and a form, the body. This identity that you so proudly proclaim as "me" and "mine".
You can never know the Truth as such. What you can know is the false as false. In doing so, the Truth becomes self evident. You may now ask as to what exactly is false. Everything you know is false since the basic premise that you are an entity, an entity with a name and a body is false. Only by inquiring into the nature of this entity called "me" can you really unravel this mystery. All the reading and listening is not going to unravel the mystery. It is only when one starts to ponder over his or her own identity does the answer come all by itself.
Your True Nature is the Absolute where there is no "I". There should be no doubt about your True Nature as the Absolute (Parabrahman) and all else is false as you will Realize as you continue to investigate into your identity. Now, because you consider yourself to be this body and mind, it would be appropriate to start right here and slowly unravel the mystery of your identity by going backwards. The body is inanimate and it does not say "I". To make this clear, a dead body does not proclaim "I am dead". So, there must be some other factor that gives rise to the impression of "I" or the knowledge of being, or the knowledge of existence. Let us call this knowledge, consciousness. It is this consciousness, which is formless, that is responsible for the sense of being. When this consciousness mistakenly (for ease of understanding) identifies itself with the body, it gives rise to the concept of being an individual, the "I" or "me". Having now identified itself with the body and thinking that it is indeed the body, and having created this concept of being a person or individual, there is a feeling of separation and suffering or the feeling of something missing. The consciousness identified as an individual (Jeeva) feels incomplete and starts the search for the missing bit of information that will give it satisfaction or bliss (ananda). When the individual with the help of the Guru, comes to the clear conviction that all there is, is consciousness, then there is peace or contentment. When the individual realizes that the basic premise or idea of being an individual ("I" or "me") is false, and that the Real Self is none other than the consciousness, it is called Self Realization. In effect, the individual has disappeared in favor of the Real Self. It is only when the "I" disappears that the Real Self becomes evident.
Find out if you are individual and if so, what and where are you? Conviction comes with knowledge. Know Thy Self.