Human beings are frightening. To satisfy their own desires, they stab others' back. Even a blood-related, even a friend. And once you turn away from them, they talk about you. They judge you, they say nasty things about you; thinking they are much better than you.
"To be strong is to understand weakness. To be weak is to have fears. To have fears is to have something precious to you. To have something precious to you is to be strong."