No man pays double or twice for the same thing, forasmuch as nothing can be spent but once.
Sir William Petty (1769). “Tracts; Chiefly Relating to Ireland: Containing: I. A Treatise of Taxes and Contributions. II. Essays in Political Arithmetic. III. The Political Anatomy of Ireland. By the Late Sir William Petty. To which is Prefixed His Last Will”, p.87
