From the beginning of time man has searched for answers to the main questions of life: Who am I? What is the goal of my existence? Why does the world exist? Do we continue to exist after death? etc. These unanswered questions about the goal and meaning of life add to our everyday human suffering – Why do we need to suffer at all? It does not allow us to feel fulfillment, even when some of our everyday desires are temporarily satisfied.
We understand that if we had other sensory organs (for now we can not even imagine what kind) then we would obviously perceive the world differently. Our perception would be broader and deeper in some kind of other way. But we do not presently have such organs. This lack of knowledge of the laws of the universe causes a feeling of great discomfort within us. We suffer as we do not know how to correctly behave with each other and with nature, and we do not see the cycles of our life, death, and birth.
http://www.youtube.com/watch?v=WcwweoJDkV0