νοῦς μὲν γὰρ μὴ σκεδαννύμενος ἐπὶ τὰ ἔξω μηδὲ ὑπὸ τῶν αἰσθητηρίων ἐπὶ τὸν κόσμον διαχεόμενος ἐπάνεισι μὲν πρὸς ἑαυτόν, δἰ ἑαυτοῦ δὲ πρὸς τὴν περὶ Θεο… - Basil of Caesarea

Oh, God, enlarge within us the sense of fellowship with all living things, our brothers the animals to whom Thou gavest the earth in common with us. We remember with shame that in the past we have exercised the high dominion of man with ruthless cruelty so that the voice of the earth, which should have gone up to thee in song, has been a groan of travail.

Let one hour, the same regularly each day, be set aside for food, so that out of the twenty-four hours of day and night, barely shall this one be expended on the body, the ascetic devoting the remainder to the activities of the mind.

The very beginning of the soul’s purgation is tranquility, in which the tongue is not given to discussing the affairs of men, nor the eyes to contemplating rosy cheeks or comely bodies, nor the ears to lowering the tone of the soul by listening to songs whose sole object is to amuse, or to words spoken by wits and buffoons—a practice which above all things tends to relax the tone of the soul.