Cyropaedia: the education of Cyrus

Most men when they have more wealth than they require bury some of it underground, and let some of it rot, and some they count and measure, and they guard it and they air it, and give themselves a world of trouble, and yet for all their wealth they cannot eat more than they have stomach for—they would burst asunder if they did—nor wear more clothes than they can carry—they would die of suffocation—and so their extra wealth means nothing but extra work.

But I hold to it that if I make my friends rich they will be my treasures themselves, and far better guards too, for me and all we have, than if I set hired watchmen over my wealth.

One thing you must ever bear in mind: if you wish your men to follow you, remember that they expect you to plan for them.