It is written: ‘Not everyone who says to Me: “Lord, Lord” shall enter into the kingdom of heaven; but he that does the will of My Father’ (Matt. 7:21). The will of the Father is indicated in the words: ‘You who love the Lord, hate evil’ (Ps. 97:10). Hence we should both pray the Prayer of Jesus Christ and hate our evil thoughts. In this way we do God’s will.
St. Hesychios the Priest