The Fathers speak thus: "The feeling of compunction is not your own, but a gift of God; what must be yours is the labor to receive it." What kind of labor? Above all else, the labor of a virtuous life in general, and that in relation to the podvig of prayer itself in particular.
Metropolitan Anthony Khrapovitsky
"A Letter to a Priest about Prayer"
(Orthodox Life 9/10, 1977)