Half length portrait of Flint, shown side face against a medium-brown background. He wears a black gown and white stiff collar.
In 1864 he was appointed to the Chair of Moral Philosophy and Political Economy in the University of St. Andrews, a post he held until his transference to the Professorship of Divinity in the University of Edinburgh in 1876. He resigned his Chair in 1903 and died seven years later. He was invited to give the Gifford Lectures for 1907 at Edinburgh, but ill-health prevented him from delivering them.
Flint's rpeutation as a scholar of profound learning was already established when he came to Edinburgh. His writings [...] exercised a world-wide influence. He produced twelve books and nine lengthly pamphlets, all works of the highest scholarship. Though each contribution was complete in itself, it formed part of a large scheme through which he hoped to give a perfect representation of his subject.
Professor Flint lived a life apart, devoting long hours to study; but his was popular with his students, 'in whom he implanted an austere and exacting ideal of scholarship and judgment'. His services to learning were honoured by the Universities of Glasgow, Aberdeen and Princeton, which conferred on him their Doctorates of Divinity, to which Edinburgh and Yale added the honorary degree of Doctor of Laws.