At the ISI blog here. The first two paragraphs:
By the end of John Witherspoon’s first year as president of Princeton University (then, the College of New Jersey) in 1769, a small group of tutors, including the late president’s son – Jonathan Edwards Jr. – had resigned their positions at the college. Their leave had been amicable in spite of their philosophical differences with the new president. Though tolerant of the tutors’ idealism, Witherspoon had arrived in the colonies promoting Scottish realism and that brand of moral philosophy advocated by Francis Hutcheson and argued against by his predecessor at Princeton, Jonathan Edwards. The philosophical shift superintended by Witherspoon would have a profound impact on the future of the institution: natural philosophy – science – would be introduced into the curriculum; an empirical, “common sense” approach would replace the theistic-centered methodology of the old regime; the college would increasingly come to be seen as a “nursery of statesmen” rather than a seminary. In the ensuing years, Witherspoon himself would become active in politics as a member of the Continental Congress and signatory of the Declaration of Independence.
Despite the progress of the college during his tenure, I will argue in what follows that there was an inherent conflict between Witherspoon’s Scottish Enlightenment philosophy on the one hand and his Calvinist Presbyterian orthodoxy on the other. Such incoherence did not characterize the thought of Jonathan Edwards. Witherspoon was an epistemological optimist: he advocated an empirical approach to the study of ethics, believing “a time may come when men, treating moral philosophy as Newton and his successors have done natural, may arrive at greater precision. It is always safer in our reasonings to trace facts upwards than to reason downwards upon metaphysical principles.” In his Lectures on Moral Philosophy, Witherspoon teaches that “the principles of duty and obligation must be drawn from the nature of man,” though he concedes that “there is nothing certain or valuable in moral philosophy, but what is perfectly coincident with scripture” (Works of the Rev. John Witherspoon 1802: 3.470, 380, 471).