Prayer: Does It Make Any Difference? by Philip Yancy

If I suffer a time of spiritual aridity, of darkness and blankness, should I stop praying until new life enters my prayer? Every one of the spiritual masters insists, No. If I stop praying, how will I know when prayer does become alive again? And, as many Christians have discovered, the habit of not praying is far more difficult to break than the habit of praying.