Taxation is to a nation what the circulation of the blood is to he individual; absolutely essential to life. In ordinary times it is the chief burden which government imposes upon the people, and is likely, therefore, to be the greatest source of discontent. This renders it of the utmost importance that taxation should as nearly as possible be just, and also that it should appear to those who pay it to be just. Absolute justice, however, is unattainable.
Cooley, Thomas M. "Remedies of Illegal Taxation." Am. L. Reg. 29 (1881): 1-16.