Cyropaedia (2.2.27-2.2.31)

Let me assure you of this, too, my friends,

that the weeding out of the vicious will bring not only this advantage, that the vicious will be out of the way, but also among those who remain the ones that have already been infected with vice will be purged of it, while the virtuous seeing the vicious disgraced will cleave more eagerly to virtue.

Well, Sambaulas,

so you also have adopted the Greek fashion, have you, and take about with you everywhere this youngster who is now beside you, because he is so handsome?

Yes, by Zeus,

at all events I enjoy both his company and his looks.

In the name of the gods, Sambaulas, what has this fellow done to make such a hit with you?

By Zeus, fellows,

I will tell you. Every time that I have called him, whether by day or by night, he has never made any excuse saying that nor has he answered my call slowly, but always on a run. And as often as I have bidden him do anything, I have never seen him perform it without sweat; and besides, by showing them not by precept but by example what sort of men they ought to be, he has made his whole squad of ten just like himself.

And yet,

although he is such an excellent fellow, you don’t kiss him as you do your relatives?

No, by Zeus, for he is not fond of hard work; for if he wished to kiss me, that would be an ample substitute for all his drill-work.