We do not pray for the sake of praying, but for the sake of being heard. We do not pray in order to listen to ourselves praying but in order that God may hear us and answer us. Also, we do not pray in order to receive just any answer: it must be God's answer.
Thomas Merton. Thoughts in Solitude
(From The Merton Institute on the 60th National Day of Prayer on May 5, 2011)