Cicero’s comprehensive treatise on the Commonwealth known as De Republica is a work whose direct and practical purpose was to arouse Roman citizens to the dangers which then threatened destruction to the liberties of their country. In appealing to his countrymen "to rise on stepping-stones of their dead selves to higher things," the inspired patriot did not hesitate to promise that all patriotic and philanthropic statesmen should not only be rewarded on earth by the approval of their own consciences and the applause of all good citizens, but by immortal glory in a realm beyond the grave.

Natural moral law stands at the center of Western ethics and jurisprudence and plays a leading role in interreligious dialogue. Although the greatest source of the classical natural law tradition is Thomas Aquinas's Treatise on Law, the Treatise is notoriously difficult, especially for nonspecialists. J. Budziszewski has made this formidable work luminous. This book - the first classically styled, line-by-line commentary on the Treatise in centuries - reaches out to philosophers, theologians, social scientists, students, and general readers alike. Budziszewski shows how the Treatise facilitates a dialogue between author and reader. Explaining and expanding upon the text in light of modern philosophical developments, he expounds this work of the great thinker not by diminishing his reasoning, but by amplifying it.