Matthew 5:14-16
“You are the light of the world. A city on a hill cannot be hidden. 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. In the same way, let your light shine before men, that they may see your good deeds and praise your Father in heaven.
As no darkness can be seen by anyone surrounded by light; so no trivialities can capture the attention of anyone who has his eyes on Christ.
The man who keeps his eyes upon the head and origin of the whole universe has them on virtue in all its perfection; he has them on truth, on justice, on immortality and on everything else that is good, for Christ is goodness itself.
By contrast, the fool gropes in darkness. No one who puts his lamp under a bed instead of on a lamp-stand will receive any light from it.
Gregory of Nyssa (AD 335-395)
Where is your lamp?