Lyric discussion by Jcont12 

Cover art for May I lyrics by Trading Yesterday

I agree with the above. However for me I can see this also as a parent's promise to his/her child. When the song mentions light starting to fade it means every time the child will go through rough times, and the father letting his child know he will always be there to love him unconditionally and protect him. I envision a father singing this to his baby perfectly!