Chapter 15 of The Untethered Soul is titled, the path of unconditional happiness. I think a better word for happiness is "at peace".  I know that I will never reach a point in my life that I could be happy if my child got a life threatening disease, although I could be at peace with it after some serious crying and whatever I found necessary to achieve acceptance.  This chapter is what most people are looking for. The title says all. Your peace comes from the conditions that you require to be at peace. Until you agree with yourself you're going to be at peace no matter what happens, you'll never find this. Lasting peace can only be found through Complete acceptance of yourself, others, life, and the world , while maintaining an open heart.