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

It is difficult to live in and enjoy the moment when you are thinking about the past or worrying about the future.

I believe in good and evil," said Jem. "And I believe the soul is eternal. But I don't believe in the fiery pit, the pitchforks, or endless torment. I do not believe you can threaten people into goodness.

Worrying about outcomes over which I have no control is punishing myself before the universe has decided whether I ought to be punished.

Some people spend so much time worrying about what might happen that they never enjoy what is happening [now] . . . Today is the tomorrow you worried about yesterday.