"The happiness which comes from long practice, which leads to the end of suffering, which at first is like poison, but at last like nectar - this kind of happiness arises from the serenity of one's own mind. "

The happiness which comes from long practice, which leads to the end of suffering, which at first is like poison, but at last like nectar - this kind of happiness arises from the serenity of one's own mind.
” 
― Ved Vyasa, The Bhagavad Gita