Following the Parable of the Sower, which is obviously about the sowing of divine seed, where the sower depicts first of all Christ, then his apostles, then their successors – that is us today – come these further passages in chapter 4, that are all on the same subject. The Saviour hasn't changed the subject, and he continues speaking about his people as light bearers of the gospel of grace, of the message of salvation.
There are even churches that have the lamp; they have the gospel; they have the redeeming word, but they hide it; they do not make it known. The illustration rather assumes a lamp that has been lit, that is giving out light. But we could put it another way, and say that they have the lamp but they never even light it. It is left out and buried somewhere and there is no evangelism. There is no visitation of the community, no gospel call going out, and no specific evangelistic sermons being preached. There is just a little word here and there, perhaps, for the unconverted at best, but no persuasive preaching of the gospel. ‘Is a lamp brought to be put under a bushel or under a bed and not to be set on a candlestick [lampstand]?’ Of course not: it is put in an elevated position so that the whole room is illuminated and all can see. Most people lived in one-room houses in those days. Obviously, it’s the lamp of the gospel, and the room is, if you like, the world in this case, the community. What's the purpose of the gospel in the hands of saved people? To make it known.
What about individuals? What about our personal witness, and our taking of every opportunity, and our praying for opportunities to speak to people within the family, within the business, within our workplace, of whatever kind as opportunity arises? We have this lamp. It is the most precious thing imaginable: the lamp of salvation, the knowledge of the world and the meaning and purpose of life, and the destiny of every human being, and the way of salvation. What do we do with it? Hide it, make it obscure, keep silent about it? The light is propagated by a message, and we are called to be the messengers.