To Pray without Ceasing is a web app that prays for the needs of Twitter users. Each day the system searches for tweets expressing needs (e.g. “I really need a hug right now”) and, using various techniques of natural language processing to generate responses to these tweets, produces a 24-hour-long liturgy based on the “Liturgy of the Hours.” Visitors to the web app activate it by tending to several virtual candles. As long as one of these remains lit, the system will proffer prayers. By participating in its ritual, viewers are invited to consider and feel what it would be like to put down their own worries and instead care for others without limits.