Catholic Social Teaching (CST) is the Church's body of doctrine on matters of social justice, human dignity, and the common good. Its seven key principles are: (1) Life and Dignity of the Human Person — every human life is sacred from conception to natural death. (2) Call to Family, Community, and Participation — people have a right and duty to participate in society. (3) Rights and Responsibilities — every person has fundamental human rights and corresponding duties. (4) Option for the Poor and Vulnerable — the needs of the poor must take priority. (5) The Dignity of Work and Rights of Workers — work is a form of participation in God's creation. (6) Solidarity — we are one human family regardless of national, racial, or economic differences. (7) Care for God's Creation — we are stewards of the earth.