Variety: Matthew 5:15

Neither do people light a lamp and put it under a bowl. Instead they put it on its stand, and it gives light to everyone in the house. (Matthew 5:15)

Archbishop Romero (who was murdered while leading worship by the authorities in Argentina) said:  

A Christian community is evangelized in order to evangelize. A light is turned on in order to give light. “People do not light a candle and put it under a basket,” said Christ. “They light it and put it up high so that it gives light” (Matthew 5:15). That is true community. A community is a group of women and men who have found the truth in Christ and in his Gospel and join together to follow the way of truth more resolutely. It is not just a matter of individual conversion but of community conversion. A community is a family that believes; it is a group where each member accepts God and feels strengthened by the others. In their moments of weakness, they help one another and love one another; they shed the light of their faith as an example for others. When that happens, the preachers no longer need to preach because there are Christians whose very lives have become a form of preaching.  

I said once before and I repeat today, sisters and brothers, that if some sad day they silence our radio and stop us from writing in our newspaper, then all of you who believe must become microphones, radio stations, and loudspeakers—not by talking but by living the faith. [2]