Xenophon, Ways and Means
E. C. Marchant, G. W. Bowersock, tr. Constitution of the Athenians., Ed.

All these advantages, as I have said, are, I believe, due to the country itself. But instead of limiting ourselves to the blessings that may be called indigenous, suppose that, in the first place, we studied the interests of the resident aliens. For in them we have one of the very best sources of revenue, in my opinion, inasmuch as they are self-supporting and, so far from receiving payment for the many services they render to states, they contribute by paying a special tax. [2] I think that we should study their interests sufficiently, if we relieved them of the duties that seem to impose a certain measure of disability on the resident alien without conferring any benefit on the state, and also of the obligation to serve in the infantry along with the citizens. Apart from the personal risk, it is no small thing to leave their trades¹ and their private affairs.² [3] The state itself too would gain if the citizens served in the ranks together, and no longer found themselves in the same company with Lydians, Phrygians, Syrians, and barbarians of all sorts, of whom a large part of our alien population consists. [4] In addition to the advantage of dispensing with the services of these men, it would be an ornament to the state that the Athenians should be thought to rely on themselves rather than on the help of foreigners in fighting their battles. [5]

If, moreover, we granted the resident aliens the right to serve in the cavalry and various other privileges which it is proper to grant them, I think that we should find their loyalty increase and at the same time should add to the strength and greatness of the state. [6]

Then again, since there are many vacant sites for houses within the walls, if the state allowed approved applicants to erect houses on these and granted them the freehold of the land, I think that we should find a larger and better class of persons desiring to live at Athens. [7]

And if we appointed a board of Guardians of Aliens analogous to the Guardians of Orphans, and some kind of distinction were earmarked for guardians whose list of resident aliens was longest, that too would add to the loyalty of the aliens, and probably all without a city would covet the right of settling in Athens, and would increase our revenues.