Carol

“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”
― Cassandra Clare, City of Heavenly Fire

“I know about parabatai,” said Magnus, an angry, dark undercurrent to his voice. “I’ve known parabatai so close they were almost the same person; do you know what happens, when one of them dies, to the one that’s left —?”
― Cassandra Clare, City of Lost Souls

“Wherever we are, we are as one”
― Cassandra Clare, The Infernal Devices: Clockwork Princess

“I have heard sometimes that men who lose an arm of a leg still feel that pain in those limbs, though they are gone,' said Will. 'It is like that sometimes. I can feel Jem with me, though he is gone, and it is like I am missing a part of myself.”
― Cassandra Clare, Clockwork Princess