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 important to know what you don't want.

You solely owe success and happiness to yourself. So why not make your inner-self proud of your daily decisions and actions?

People don't get to choose their family, but if you have the family you would choose - that's happiness.

Keep cool. Anger is not an argument.

Be very careful when you judge another human being. Do not measure anybody strictly based on the bad you see in them and ignore all the good. Be wary of any man who intentionally ignores another man's record of deeds or work history simply to impose their own agenda. Such a man's judgment lacks merit and should be disregarded immediately. Without a conscience, there is no truth in them.