How do you think, what is light?
electromagnetic radiation with a dual nature (typical of quantum physics) in that it behaves at times like a wave and at times like a particle. Travels at about 160,000 miles per second, and its speed is the same no matter what the speed of the observer measuring it. What we call visible light is only a small part of the huge spectrum of electromagnetic radiation that our human eyes have evolved the ability to detect directly. Is that what you were looking for?
Your reference cited for light refers to the inner light and not the light outside, like the sun or a light bulb, etc. The inner light is not a metaphor, rather an actual light. Now, I know you've seen that light when you were a child, but you have forgotten it. Go find a teacher that can show it to you. Yes, you need a teacher. Many people talk about light, but no one can reveal it to you, except that one perfect teacher. Start searching, and when you find him, eMail me. Good luck.
Hmmmmm, you could take alot from the reference given. If you mean the book of Genesis, then the light you refer to is not what most folks in science are speaking of. Sure, you could rip open the Einstein debate about how God does not play dioce with the universe and get a real open disussion on quantum physics etc etc etc However, In him is the light refers to just that, the light that is everything we will or can know. Recall, that darkness was used to seperate the day and night, so in reality light in this context can also refer to the absence of light, in short life and creation coming from nothingness....
Hey Yojik ! Light is something which reveals the darkness and things hidden in it. So light comes to those when they realise that they r doin a sin.