The quest or search for reality in life and living is within each of us and is what makes human beings distinctly different than anything that has been created. It's like a seed that's placed within the soul of humanity searching for fertile ground to find root in a truthful reality, even when we are told there is no reality to be found. The two basic realities we all must realize is that the universe exists, and has a reason for being there and what part we play within it; and that man is unique, and is searching for purpose and has questions that need answers.
Humanity cannot escape the reality of what is, no matter what we believe or think. Even Jean Paul Sartre, had no answer for this but stated “... something is there.” Any serious thinking has to reason out and explain these two great phenomena of the universe and man. Some “cause” that has always been and is coherent and can be known, it's like reading a map that a designer has laid out with the beginning starting point as well as the final destination and all the important points in between. Many systems have a hit and miss approach in them, some things you can follow but other things you cannot, their map for life or what is real are not clear or have no reasoning to follow. Some of this we are told comes from within one's own mind and cannot be explained fully, or you have to find within yourself your own experience or reality.