Everyone is hankering for happiness because by nature we are happy : anandamayo 'bhyasat (Vedanta-sutra 1.1.12). As spirit souls we are naturally happy, blissful.
There is no peace or happiness in our worldy life. Circumstances create turmoil and annoyance.
When we understand our relationship with God then we all will be happy. It is an essential factor for establishing peace in the world.
That procedure which in the beginning may be just like poison but at the end is just like nectar and which awakens one to self-realization is said to be happiness in the mode of goodness.