True Fasting

How and why do you fast? What is fasting? When we fast what is God looking from us? Are we doing it because we are "supposed to?" Do we do it because it's what Christians are supposed to do? Or are we fasting because we really want to cleanse ourselves - be pure and holy - a vessel able to communicate with God?

"...we cannot manipulate God by going through the motions of godliness. God looks for reality."

Reading will be Isaiah 58