“Whatever the heart is, such will be the gift. If you pray with faith, sincerely, with all your heart, not hypocritically, then a gift will be given you by the Lord in accordance with your faith, in accordance with the degree of the fervor of your heart. And, on the contrary, the colder your heart is, the more incredulous and hypocritical it is, the more useless will be your prayer; not only this, the more it will anger the Lord, Who is a Spirit, and seeks to be worshiped in spirit and in truth.”
(St John of Kronstadt, ‘My Life in Christ’)