One desire, and only one?

“The more we acquire the more we crave, and the deeper our sadness when our yearning is not satisfied. Lads, listen to me: If you crave happiness, do not waste your life struggling for that which you really do not need." ~ Yalom
 
It is so tempting; it is so seductive when happiness and joy seem to elude me to search for a quickly available substitute. Nothing I think I may need will ever truly bring me a deeply grounded sense of Peace. 
Love, Diederik