Prayer is meaningless unless it is subversive,
unless it seeks to overthrow and to ruin
the pyramids of callousness, hatred, opportunism, falsehood.

The liturgical movement must become a revolutionary movement,
seeking to overthrow the forces that continue to destroy
the promise, the hope, and the vision.

on prayer - rabbi abraham joshua heschel
Excerpt from Moral Grandeur and Spiritual Audacity a book of essays.