The Wealth of Nations by Part 5 Chapter 2 Page 267

They have no bowels for the contributors, who are not their subjects, and whose universal bankruptcy, if it should happen the day after their farm is expired, would not much affect their interest. In the greatest exigencies of the state, when the anxiety of the sovereign for the exact payment of his revenue is necessarily the greatest, they seldom fail to complain that without laws more rigorous than those which actually take place, it will be impossible for them to pay even the usual rent. In those moments of public distress their demands cannot be disputed. The revenue laws, therefore, become gradually more and more severe. The most sanguinary are always to be found in countries where the greater part of the public revenue is in farm; the mildest, in countries where it is levied under the immediate inspection of the sovereign.