Light 1

And God said, "Let there be Light; and there was Light. - Genesis 1:3	This speaks of the creation of light when God created the physical universe. This physical light can also be seen as a metaphor of Spiritual Light, given to man by God through the Living Word (Christ), the Written Word (the Bible) and the illumination of the Holy Spirit.
The Bible has many passages about Spiritual Light. In this passage the psalmist is saying that God's Word Lights his walk in the world.	Thy word is a lamp unto my feet, and a light unto my path. - Psalm 119:105
The people which sat in darkness saw great light; and to them which sat in the region and shadow of death light is sprung up. - Is. 9:1, 2 and Matt. 4:16, 17	This is one of the prophecies that Jesus fulfilled when He came into the world. This passage from Isaiah in the Old Testament is repeated in the Gospel of Matthew, to specify that Jesus was the Messiah that the Jews were looking for and the Light come to the whole world, including the Gentiles.
The gospel of John opens with the passage, "In the beginning was the Word, and the Word was with God, and the Word was God." Jesus was the Living Word come into the world to bring the Light. In Him was "zoe" or the Life of God. The word "comprehended" in the KJV means "apprehended," i.e. the darkness has no power against the Light.	In Him was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not. - John 1:4, 5
Then spake Jesus again unto them, saying, I am the light of the world; he that followeth me shall not walk in darkness, but shall have the light of life. - John: 8:12	Jesus lays claim to His coming forth from God as the Messiah of the Jews and the One Who brings Light to the whole world. All who receive and follow Him will have the Light of God's life (zoe) in them.
Those who are in darkness (or spiritual ignorance) manifest their condition by the way that they live, the works that they do, and their repugnance to the Light of Christ. Evil deeds are reproved by the Light, and that is why those in darkness hate it. Those who are drawn to, come to, and walk in the Light will manifest the works of God.	For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. But he that doeth truth cometh to the light, that his deeds may be manifest, that they are wrought in God. - John 3:20, 21
Ye are the light of the world. A city that is set on a hill cannot be hid. Neither do men light a candle and put it under a bushel; but on a candlestick; and it giveth light unto all that are in the house. Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven. - Matt. 5:14-16	Jesus is speaking here to His disciples. He came to bring the Light and made it possible for men to receive the Light and walk in it. His command in this passage is that His followers, the Body of Christ, are to be the Light to the world, shine it openly before the world and allow men to see the good works of God working through them, so that God may be glorified. This is what true "witnessing" is. A "city set on a hill" is a metaphor of the Body of Christ, and the "candle" is a metaphor for the individual Christian.
This is a perfect analogy between physical light and Spiritual Light. Both make something manifest; the physical light makes physical objects manifest, and Spiritual Light makes Spiritual Truth manifest. Light also makes evil works manifest. See John 3:20. An interesting note here. The word translighted light in the phrase "Christ shall give thee light," is not "phos" as most of the others are, but "epiphausko" which means Christ will pour divine truth into, or give spiritual enlightenment to, the believer. This speaks of revelation.	But all things that are reproved are made manifest by the light: for whatsoever doth make manifest is light. Wherefore he saith, Awake thou that sleepest, and arise from the dead; and Christ shall give thee light. - Eph. 5:13-14
For ye were sometimes darkness, but now are ye light in the Lord; walk as children of light. - Eph. 5:8	All who come to the Light and receive the Light once walked in darkness (spiritual ignorance and blindness.) Now that they have the Light, they are to walk in it.
There is no darkness in God. Those who belong to Him have His Light. Walking in darkness (spiritual ignorance) is an indication one does not know God. To walk in the Light is to have God's Spirit within and the desire to follow and "walk in" the Light. He will shine His Light into all the dark spots in our heart and lead us to turn from them into the Light. This is the effectual gospel. Partaking of the saving power of Jesus Christ is connected to having the Light and walking in it.	This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all. If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth. But if we walk in the light, as he is in the light, we have fellowship one with another and the blood of Jesus Christ his Son cleanseth us from all sin. - 1 John: 1:5-7