What are we hungry for? (IM 700)

We all have a choice to make throughout our lives and behind every choices we make there is some hidden story. That story is our past experience or the external influence. It is said that most people make an easy choices but it seems to me like we make a difficult choices most of the time. Our mind is destined for challenge. Even in the time of peace and happiness, our mind continuously seeks for unhappy moments and struggles. And our mind forces us to follow the thoughts manufactured by him. It makes sense that human happiness more than anything else. But we keep letting our mind make those stuff that deters happiness. What are we hungry for? Why we are always seeking happiness because we seek those stuff which we lack?   PS: It has been 700 days of blogging everyday in iminds and still many more to go...