Based on Bhagavad Gita Chapter 09, Text 13
As spiritual seekers, werecognize that immoral sinful pleasures are obstacles on the spiritual pathway. What we may not recognize is that even innocent pious pleasures are also obstacles. Let’s see how.
Whatever gives us pleasure occupies a place in our heart. When we seek pleasure in sins, we exile Krishna from our heart and enthrone the sin-inducing objects there. When we seek innocent pleasures, we don’t exile Krishna from our heart, but we force him to share our heart with the pleasure-providing objects. This mixed devotion falls far below the standard of pure devotion, of making Krishna the only master of the heart, as indicated in the Bhagavad-gita (9.13: bhajanty ananya manaso).
Being aspiring devotees, weknow that such pure devotion is our ideal. Special holy days beckon us as opportunities to make the ideal the actual. Fasting on these holy days is a time-honored way to leave ourselves with no source of nourishment and fulfillment except the remembrance of Krishna.
Read More – http://www.gitadaily.com/2012/06/01/fasting-is-an-opportunity-to-sacrifice-the-good-for-the-best/