The Wealth of Nations by Part 5 Chapter 2 Page 32

examination of the tax-gatherers, it may expose them to much unnecessary trouble, vexation, and oppression; and though vexation is not, strictly speaking, expense, it is certainly equivalent to the expense at which every man would be willing to redeem himself from it. It is in some one or other of these four different ways that taxes are frequently so much more burdensome to the people than they are beneficial to the sovereign.

The evident justice and utility of the foregoing maxims have recommended them more or less to the attention of all nations. All nations have endeavoured, to the best of their judgment, to render their taxes as equal as they could contrive; as certain, as convenient to the contributor, both in the time and in the mode of payment, and, in proportion to the revenue which they brought to the prince, as