["F]or it's not possible," [Socrates] said, "for anybody to experience a greater evil than hating arguments. Hatred of arguments and hatred of human beings come about in the same way. For hatred of human beings arises from artlessly trusting somebody to excess, and believing that human being to be in every way true and sound and trustworthy, and then a little later discovering that this person is wicked and untrustworthy - and then having this experience again with another. And whenever somebody experiences this many times, and especially at the hands of just those he might regard as his most intimate friends and comrades, he then ends up taking offense all the time and hates all human beings and believes there's nothing at all sound in anybody.
Plato, Phaedo
evil, evils, hate, hurt, trusted