Chapter 32 — Part III: The Decalogue — The Ninth and Tenth Commandments
Section 4. The second reason (for the promulgation) of these two Commandments is that they distinctly and in express terms prohibit some things of which the sixth and seventh Commandments do not contain an explicit prohibition. The seventh Commandment, for instance, forbids an unjust desire or endeavour to take what belongs to another; but this Commandment further prohibits even to covet it in any way, even though it could be acquired justly and lawfully, if we foresee that by such acquisition our neighbour would suffer some loss.