Grief grows from desires and attachment. Happiness cannot be attained from satisfying the desires as new desires crop up. Hence, happiness lies in contentment. Happiness leads to peace of mind. Peace of mind results in concentration.
Concentration is the basis of meditation.
Through meditation mind is united with Sachchidanada. There is no happiness higher than this. Bliss is the greatest happiness. One should not proclaim that he knows everything. One should be free from ego, pride, and prejudice.