Ye are the light of the world. A city that is set on an hill cannot be hid.
Isaiah 6:1-3
1 ARISE [from the depression and prostration in which circumstances have kept you–rise to a new life]! Shine (be radiant with the glory of the Lord), for your light has come, and the glory of the Lord has risen upon you! [Zech. 8:23.]
2 For behold, darkness shall cover the earth, and dense darkness [all] peoples, but the Lord shall arise upon you [O Jerusalem], and His glory shall be seen on you. [Isa. 60:19-22; Mal. 4:2; Rev. 21:2, 3.]
3 And nations shall come to your light, and kings to the brightness of your rising. [Isa. 2:2, 3; Jer. 3:17.]
Matthew 4:16 (KJV)
16 The people who sat (dwelt enveloped) in darkness have seen a great Light, and for those who sat in the land and shadow of death, Light has dawned.
Ephesians 5:8-11, 14
8 For once you were darkness, but now you are light in the Lord; walk as children of Light [lead the lives of those native-born to the Light]. 9 For the fruit (the effect, the product) of the Light or the Spirit [consists] in every form of kindly goodness, uprightness of heart, and trueness of life.
10 And try to learn [in your experience] what is pleasing to the Lord [let your lives be constant proofs of what is most acceptable to Him]. 11Take no part in and have no fellowship with the fruitless deeds and enterprises of darkness, but instead [let your lives be so in contrast as to] expose and reprove and convict them.
14 Therefore He says, Awake, O sleeper, and arise from the dead, and Christ shall shine (make day dawn) upon you and give you light. [Isa. 26:19; 60:1, 2.]
For with You is the fountain of life; in Your light do we see light. [John 4:10, 14.]
For now we are looking in a mirror that gives only a dim (blurred) reflection [of reality as in a riddle or enigma], but then [when perfection comes] we shall see in reality and face to face! Now I know in part (imperfectly), but then I shall know and understand fully and clearly, even in the same manner as I have been fully and clearly known and understood [by God].
And the city had no need of the sun, neither of the moon, to shine in it: for the glory of God did lighten it, and the Lamb is the light thereof.