He whose longing has been aroused for the indescribable, whose mind has been quickened by it, and whose thought is not attached to sensuality is truly called one who is bound upstream.
Monks, when ignorance is abandoned, and knowledge arises in the monk, with the ending of ignorance and the arising of knowledge he clings neither to sense-pleasures, nor does he cling to views, nor to precepts and vows, nor to a Self-doctrine. Not clinking, he is not disturbed; not disturbed, he attains individually nibbana.
Compassion suits our physical condition, whereas anger, fear and distrust are harmful to our well-being. Therefore, just as we learn the importance of physical hygiene to physical health, to ensure healthy minds, we need to learn some kind of emotional hygiene.
It may seem unrealistic to think we can ever become free from hatred, but Buddhists have systematic methods for gradually developing a tolerance powerful enough to give such freedom.