The Light Lyrics

Lyric discussion by nevercry 

Cover art for The Light lyrics by Mirah

To build on the comments already presented, I thought that she might be depressed and suicidal, but after her initial submersion she sees the titular "light". Water can serve as a type of baptism, and she speaks often of religious tones, "heaven is the future", etc. The first verses of the song actually condemn suicide as a "sorry waste to take the easy way out".

Instead of wishing to die, the speaker finds new hope in religion and encourages others to look for new hope.

(I'm not a devout Christian, nor overtly religious; this is just my interpretation.)

I think you've got it.