35 Jesus heard that they threw him out and having found him said, “Do you believe in the Son of Man?” 36 The man answered and said, “And who is He Sir, that I may believe in Him?” 37 Jesus said to him, “You have seen Him and and He is the One speaking with you.” 38 And he said, “I believe Lord.” And he worshiped Him. 39 And Jesus said, “For judgment I came into this world that the ones who do not see may see and the ones who see may become blind.” John 9:35-39 (translated from the NA28 Greek text)
In the Word of God, light is associated God’s way, His truth, what is right, et cetera. Darkness is the antithesis of light in this sense. While those who walk in God’s light walk in His truth, those who walk in darkness, walk in ignorance of His truth and His ways….
Those who are of God’s light are growing in the knowledge of Christ while those who walk in darkness continue in their ignorance. In John 1:4-5 , the Apostle John said, “ἐν αὐτῷ ζωὴ ἦν, καὶ ἡ ζωὴ ἦν τὸ φῶς τῶν ἀνθρώπων· καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει, καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν.” Or, “In Him was life and the life was the light of men; and the light shines in the darkness and the darkness has not overcome it.” Jesus as the “light” brings to the dark world true knowledge, moral purity, and the light that shows the very presence of God. The darkness of this fallen world cannot comprehend, grasp, or overcome the light of our Lord.