Terribleness is part of greatness: let us not deceive ourselves. - Friedrich Nietzsche

Our faith in others betrays that we would rather have faith in ourselves. Our longing for a friend is our betrayer. And often with our love we want merely to overcome envy. And often we attack and make ourselves enemies, to conceal that we are vulnerable.

The one necessary thing. — A person must have one or the other. Either a cheerful disposition by nature, or a disposition made cheerful by art and knowledge.

Lo que no te mata te hiere de gravedad y te deja tan apaleado, que luego aceptas cualquier tipo de maltrato y te dices a ti mismo que eso te fortalece.