The theatre lulls the Christian life to sleep, destroys it, communicating to the life of Christians the character of the life of heathens. "They all slumbered and slept" (St. Matthew 25:5); this disastrous sleep is produced, amongst other things, also by the theatre. And what besides? The sciences, taught in the spirit of heathenism, worldly cares carried to excess, love of gain, ambition and sensuality. The theatre is the school of this world, and of the Prince of this world—that is, the Devil, but sometimes he is transformed into an angel of light in order to more easily tempt people who are not far-seeing, he sometimes introduces an apparently moral play on to the stage, but this is done in order that everybody should proclaim and repeat that the theatre is a most moral institution, and that it is not less worth frequenting than the church, and even, perhaps more so, because in church everything is the same, whilst in the theatre there is a variety of plays, scenery, costumes and actors.
Most men not only bear Satan's burden willingly in their hearts, but they become so accustomed to it that they often do not feel it, and even imperceptibly increase it. Sometimes, however, the evil enemy increases his burden tenfold, and then they become terribly despondent and fainthearted, they murmur and blaspheme God's name. The usual means that men of our time take to drive away their anguish are—entertainments, cards, dancing, and theatres. But such means afterwards increase still more the anguish and weariness of their hearts. If, happily, they turn to God, then the burden is removed from their heart, and they clearly see that previously the heaviest burden was lying on theit heart, though frequently they did not feel it. O, how many men there are who have "forsaken [God] the Fountain of living waters, and hewed them out cisterns, broken cisterns, that can hold no [living] water"! Men have very many such broken cisterns—nearly everybody has his own. The broken cisterns are our hearts, our passions....
http://orthodoxinfo.com/praxis/holy-elders-on-television.aspx
