You are the light of the world. A city that is set on a hill cannot be hid.
All Commentaries on Matthew 5:14 Go To Matthew 5
Augustine of Hippo
AD 430
By the world here we must not understand heaven and earth, but the men who are in the world; or those who love the world for whose enlightenment the Apostles were sent.
Or, the mountain is the great righteousness, which is signified by the mountain from which the Lord is now teaching.
Serm. in Mont., i, 7: Had He only said, “That they may see your good works,” He would have seemed to have set up as an end to be sought the praised of men, which the hypocrites desire; but by adding, “and glorify your Father,” he teaches that we should not seek as an end to please men with our good works, but referring all to the glory of God, therefore seek to please men, that in that God may be glorified.