Jesus told his disciples to let their light shine and not hide it under a bushel basket. Light easily overcomes darkness. It only takes the light of one candle to overcome the darkness of a room. So if we put our light on a lampstand—the light he gave us—darkness has no chance.
Based on Mark 4:21-25
Jesus said to his disciples, ‘Is a lamp brought in to be put under the bushel basket, or under the bed, and not on the lampstand? For there is nothing hidden, except to be disclosed; nor is anything secret, except to come to light. Let anyone with ears to hear listen!’ And he said to them, ‘Pay attention to what you hear; the measure you give will be the measure you get, and still more will be given you. For to those who have, more will be given; and from those who have nothing, even what they have will be taken away.’
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)