It was like a mask had been pulled away from his face, uncovering a monster hidden beneath his friendly façade.

Mark nodded even though she couldn't see. He'd suddenly lost any desire to talk, and his plans for a perfect day washed away with the stream. The memories. They never let him go, not even for a half hour. They always had to rush back in, bringing all the horror.

Every danger loses some of its terror once its causes are understood.

Value your parabatai," he said. "For it is a precious bond. All love is precious. It is why we do what we do. Why do we fight demons? Why are they not fit custodians of this world? What makes us better? It is because they do not build, but destroy. They do not love, but hate only. We are human and fallible, we Shadowhunters. But if we did not have the capability to love, we could not guard humans; we must love to guard them. My parabatai, he loved like few ever could love, with all and everything. I see you are like that too; it burns more brightly in you than the fire of Heaven

The degree of freedom we enjoy outwardly is a reflection of the degree of love we cultivate inwardly.

Force is incomplete and therefore has to be fed energy constantly. Power is total and complete in itself and requires nothing from outside.