In all things of any difficulty and importance, those who can do them well are fewer than the need, even with the most unrestricted latitude of choice: and any limitation of the field of selection deprives society of some chances of being served by the competent, without ever saving it from the incompetent.
 John Stuart Mill, The Subjection of Women (1869). copy citation

Context

“If only once in a dozen years the conditions of eligibility exclude a fit person, there is a real loss, while the exclusion of thousands [Pg 34] of unfit persons is no gain; for if the constitution of the electoral body disposes them to choose unfit persons, there are always plenty of such persons to choose from. In all things of any difficulty and importance, those who can do them well are fewer than the need, even with the most unrestricted latitude of choice: and any limitation of the field of selection deprives society of some chances of being served by the competent, without ever saving it from the incompetent. At present, in the more improved countries, the disabilities of women are the only case, save one, in which laws and institutions take persons at their birth, and ordain that they shall never in all their lives be allowed to compete for certain things.” source