 The ubiquity and significance of respect and self-respect in everyday life largely explains why philosophers, particularly in moral and political philosophy, have been interested in these two concepts. They turn up in a multiplicity of philosophical contexts, including discussions of justice and equality, injustice and oppression, autonomy and agency, moral and political rights and duties, moral motivation and moral development, cultural diversity and toleration, punishment and political violence, and a host of applied ethics contexts. Although a wide variety of things are said to deserve respect, contemporary philosophical interest in respect has overwhelmingly been focused on respect for persons, the idea that all persons should be treated with respect simply because they are persons. This focus owes much to the 18th century German philosopher, Immanuel Kant, who argued that all and only persons and the moral law they autonomously legislate are appropriate objects of the morally most significant attitude of respect. Although honor, esteem, and prudential regard played important roles in moral and political theories before him, Kant was the first major Western philosopher to put respect for persons, including oneself, at the very center of moral theory, and his insistence that persons are ends in themselves with an absolute dignity who must always be respected has become a core ideal of modern humanism and political liberalism. In recent years many people have argued that moral respect ought also to be extended to things other than persons, such as nonhuman living beings and the natural environment.