Prayer And Satan

Πολλοὶ μὲν εἰσὶ προσευχῆς τρόποι, ἕτερος ἑτέρου διαφορώτερος. Ὅμως οὐδὲ εἶς τρόπος εὐχῆς ἐπιβλαβὴς τυψχάνει· εἰ μή τι ἄν οὐκ ἔστιν εὐχὴ, ἀλλ' ἐργασία σατανική. Ἅγιος Μάρκος ὁ Ἐρημίτης, Περὶ Νόμου Πνευματικοῦ Source: Migne PG 65.908c

Many are the ways of prayer, one being superior to another. There is no harmful way of prayer, unless not to pray, which is a work of Satan. Saint Mark The Ascetic, On The Spiritual Law