Achieving Goodness

᾿Ασφάλισαι λόγον ἀπὸ καυχήσεως, καὶ λογισμὸν ἀπὸ οἰήσεως, ἵνα μὴ παραχωρηθεὶς πράξῃς τὰ ἐναντία. Οὐ γὰρ ἐξ ἀνθρώπου μόνον τελεσιουργεΐται τὸ ἀγαθὸν, ἀλλὰ τοῦ παντεπόπτου Θεοῦ. Ἅγιος Μάρκος ὁ Ἐρημίτης, Περὶ Τῶν Οἰομένων Ἐξ Ἔργων Δικαιοῦσθαι Source: Migne PG 65.957b

Keep the tongue secure from boasting, and keep thought from mere opinion, lest after you act quite differently. For the good is not achieved by man alone, but by the all seeing God. Saint Mark The Ascetic, On Those Who Think Themselves Justified By Works