“When you will fast then your mind will aspire and wish to
converse with God. Equally the body, which is used to fasting, will also not want to sleep and lay on the bed all night. Whoever has accustomed the body to fasting, has turned over his mind to meditation with the perfect calmness, pours out his heart in prayer, expresses grief in his face, and will not have a place for shameful thoughts at all.”
(St. Isaac the Syrian)