In general, it can be said that no contemplative life is possible without ascetic self-discipline. One must learn to survive without the habit-forming luxuries which get such a hold on men today. I do not say that to be a contemplative one absolutely has to go without smoking or without alcohol, but certainly one must be able to use these things without being dominated by an uncontrolled need for them.
Thomas Merton. New Seeds of Contemplation. (New York: New Directions Books), p 12