Enlightenment:
When we called on the name of the Lord Jesus, receiving Him into us, the divine life came into our being. Immediately we had the sense of something shining within, but perhaps, at that time, we did not have the language or the utterance to describe it. That shining was the shining of life. Because life shines, the life is the light of men. This shining is the strongest confirmation that we have been born of God.
When the Word is heard and the life is received, the life becomes the light shining within to enlighten us. When God, as the divine life, shines within us as the light of life, we are under His enlightening. Being born of God by receiving His Word, we have God as our life, and this life becomes the light within us shining all the time. The Lord is the Word of God, the expression of God by which we may know God. When we receive Him as the expression of God, He becomes our life, and this life becomes the light that shines within us.
Verse 5 says, “And the light shines in the darkness, and the darkness did not overcome it.” Darkness can never overcome or extinguish light, but light dispels darkness. When the light of life shines within us, darkness can never overcome it. Furthermore, this light is the true light which enlightens every man. The word “enlightens” in Greek is the same word used in the same way as in Ephesians 1:18; 3:9 and Hebrews 6:4; 10:32. It refers here to the inward enlightening which brings life to the ones who receive the Word. For the old creation, it was the physical light (Gen. 1:3-5, 14-18). For the new creation, it is the light of life.