There are three fundamental modes of training in Buddhist practice: morality, concentration, and wisdom. The English word morality is used to translate into the Pali term slla, although the Buddhist term contains its own particular connotations. The word sfla, denotes a state of normalcy, a condition which is basically unqualified and unadulterated. When one practices slla, one returns to one's own basic goodness, the original state of normalcy, unperturbed and unmodified. Killing a human being, for instance, is not basically human nature; if it were, human beings would have ceased to exist a long time ago. A person commits an act of killing because he or she is blinded by greed, rage or hatred. Such negative qualities as anger, hatred, greed, ill will, and jealousy are factors that alter people's nature and make them into something other than their true self. To practice slla,is thus to train in preserving one's true nature, not allowing it to be modified or overpowered by negative forces.