I believe that is the first time I've seen someone argue for natural law and positive law in the same breath.
The Second Treatise of Civil Government
1690
John Locke
1632-1704
Introduction
CHAP. I.
CHAP. II. Of the State of Nature.
CHAP. III. Of the State of War.
CHAP. IV. Of Slavery.
CHAP. V. Of Property.
CHAP. VI. Of Paternal Power.
CHAP. VII. Of Political or Civil Society.
CHAP. VIII. Of the Beginning of Political Societies.
CHAP. IX. Of the Ends of Political Society and Government.
CHAP. X. Of the Forms of a Common-wealth.
CHAP. XI. Of the Extent of the Legislative Power.
CHAP. XII. Of the Legislative, Executive, and Federative Power of the Common-wealth.
CHAP. XIII. Of the Subordination of the Powers of the Common-wealth.
CHAP. XIV. Of Prerogative.
CHAP. XV. Of Paternal, Political, and Despotical Power, considered together.
CHAP. XVI. Of Conquest.
CHAP. XVII. Of Usurpation.
CHAP. XVIII. Of Tyranny.
CHAP. XIX. Of the Dissolution of Government.
John Locke: Second Treatise of Civil Government