[145] But the idea of equality is a necessary one, and so is that of equality in proportion, according to which a few things are looked upon as equal to many, and small things are equal to larger ones. And their proportionate equality, cities are accustomed to use at suitable times, when they command every citizen to contribute an equal share of his property, not equal in number, but in proportion to the value of his assessment, so that in some cases he who contributes a hundred drachmas will appear to have brought an equal sum with him who contributes a talent.