 Sharrock's work on political philosophy, "Ὑπόθεσις ἠθική, De Officiis secundum Naturae Jus", was directed against Hobbes's views of ethics and politics (Oxford, 1660; Gotha, 1667; Oxford, 1682).It was quoted as of authority by Richard Cumberland in his "De Legibus Naturae", and by other philosophical writers.According to Jon Parkin, "The aim of "De officiis" was to prove against Hobbes a number of hypotheses on the existence of a hierarchy of duties annexed to natural law"; and the method was to "transpose" Hobbes into an Epicurean so as to use against him old arguments of Cicero.