" The next of the unwholesome actions of mind is ill will, with its many attendant variations: anger, hatred, impatience, and sorrow—all forms of aversion. We can notice the feelings of contraction and hardening of the heart when we get lost in or identified with mind states of ill will. These states of aversion arise when we don’t get what we want, or when we do get what we don’t want. They may come in response to present unpleasantness, such as pain, certain distressing emotions, or difficult life situations. Ill will of one kind or another can also arise when we remember certain past events or anticipate future ones. "

― Joseph Goldstein , One Dharma: The Emerging Western Buddhism