The two simple words, simple enough to read but complex enough to understand and achieve!!
I have used the term 'Spiritual Reality' coz every human being right from birth till death experiences it but not all the people will be having the knowledge to understand it.
Actually, If we look back at ancient times when there were Rishi munis (according to hindu mythology), they were so powerful and knowledgeable that led to understanding the mysteries of life and they possessed such powers that we couldn't imagine. In fact, we (human beings) possess all those extra-ordinary powers as well as the knowledge which the great ones had irrespective of caste, creed and religion. But, the society which we live in has led to such changes in mankind that we gradually forgot everything just like the case of degeneration of limbs in snakes.
In fact, Approx. about 6 inches above our head region there will be a invisible string that will be connected to our higher self. So, now the question arises as what this higher self is..??