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.
There is no peace or happiness in our worldy life. Circumstances create turmoil and annoyance.
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.
Joy can only be experienced when we offer our love to Krishna.