Our Saviour said: “Go into your room and pray” [Mt 6:6]. But by “room” you must understand, not so much a room enclosed by walls that imprison your body, but the room that is within you, the room where you hide your thoughts, where you keep your affections. This room of prayer is always with you, wherever you are, and it is always a secret room, where only God can see you.
Saint Ambrose