The Nature of Kavanah (inner participation)
All of us, mindful of the ancient distinction between lip-service and the service of the heart, agree that prayer is not a hothouse plant of temples, but a shoot that grows in the soil of life, springing from widespread roots hidden in all our needs and deeds. Vicious needs, wicked deeds, felt or committed today, are like rot cankering the roots of tomorrow’s prayer. A hand used in crime is an axe laid to the roots of worship.
Quest for God: Studies in Prayer and Symbolism