Eligibility to office under our political system cannot be regarded as a natural right, and some rules or regulations are therefore obviously indispensable to determine what shall be the qualifications which shall be deemed necessary or sufficient. These rules are usually express and written ones, though in a few cases they have been deduced by inference from considerations of policy or propriety
Mechem, Floyd R. "The Legal Status of the Teacher." Mich. L. Rev. 1 (1902): 17-27.