There might not be so much of a difference between the side of Light and the side of Dark as you suppose. After all, without the Dark, there is nothing for the light to burn away.

You're Valentine's son. I'm sure you're the one the Queen really wants to see. Besides, you're charming. Maybe not at the moment.

Clary stopped dead in her tracks. "Simon?" "Oh, God," said Jace, sounding resigned. "And here I'd actually hoped I'd got hold of something interesting." -Clary and Jace pg. 114

As long as we're together, I'm ready for anything.

I don't know how to live in the world as a Shadowhunter without Will. I don't think i even want to. I am still a parabatai, but my other half is gone.

What happened to you?” Jace looked affronted. “What happened to me?” Alec shook him, not lightly. “You said you were going for a walk! What kind of walk takes six hours?” “A long one?” Jace suggested.

Jem leaned closer against the chair, staring into the fire. “Better it were my hands,” he said. Will shook his head. Exhaustion was muting the edges of everything in the room, blurring the flocked wallpaper into a single mass of dark color. “No. Not your hands. You need your hands for the violin. What do I need mine for?