Aquinas and Natural Law
Aquinas's natural law theory grounds ethics in human nature understood teleologically. Reason apprehends human nature's purposes (self-preservation, procreation, social cooperation, knowledge); morality consists in fulfilling these purposes. Primary precepts are self-evident; secondary precepts derive rationally from primaries and apply natural law to specific contexts.
Real World
The Catholic Church's opposition to artificial contraception, reaffirmed in Pope Paul VI's 1968 encyclical Humanae Vitae, directly applies Aquinas's primary precept of procreation — demonstrating how natural law still shapes real-world institutional moral teaching.
Exam Focus
Always distinguish primary precepts (self-evident) from secondary precepts (derived) — confusing them loses easy AO1 marks.
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