Krispos the Emperor by Harry Turtledove

calling him merely lad, though by now Digenis of course knew who he was. He'd thought about telling Digenis to address him as your Majesty or young Majesty, but one of the reasons he visited the priest again and again was to rid himself of the taint of sordid materialism and learn humility. Humility did not go hand in hand with ordering a priest about.
    But even though he sought humility, he embraced it only so far. Trying to justify himself, he said earnestly, "Holy sir, if I let Evripos serve as my father's aide, it might give my father cause to have him succeed, rather than me."
    "And so?" Digenis said. "Would the Empire crumble to pieces on account of that? Is your brother so wicked and depraved that he would cast it all into the fire to feed his own iniquity? Better even perhaps that he should, so the generations which come after us would have fewer material possessions with which to concern themselves."
    "Evripos isn't wicked," Phostis said. "It's just that—"
    "That you have become accustomed to the idea of one day setting your baser parts on the throne," the priest interrupted. "Not only accustomed to it, lad, but infatuated with it. Do I speak the truth or a lie?"
    "The truth, but only after a fashion," Phostis said. Digenis' eyebrow was silent but nonetheless eloquent. Flustered, Phostis flounde red for justification: "And remember, holy sir, if I succeed, you will already have imbued me with your doctrines, which I will be able to disseminate throughout the Empire. Evripos, though, remains attached to the sordid matter that Skotos set before our souls to entice them away from Phos' light."
    "This is also a truth, however small," Digenis admitted, with the air of a man making a large concession. "Still, lad, you must bear in mind that any compromise with Skotos that you form in your mind will result in compromising your soul. Well, let it be; each man must determine for himself the proper path to renunciation, and that path is often—always—strait. If you
    do accompany your father on this expedition of his, what shall your duties be?"
    For a good part of it, probably nothing at all," Phostis answered, explaining, "We'll go by ship to Nakoleia, to reach the borders of the revolted province as quickly as we can. Then we march overland to Harasos, Rogmor, and Aptos; my father is arranging for supplies to be ingathered at each. From Aptos we'll strike toward Pityos. That's the leg of the journey where we'll most likely start real fighting."
    In spite of his efforts to sound disapproving, he heard the
    excitement in his own voice. War, to a young man who has never seen it face to face, owns a certain glamour. Krispos never talked about fighting, save to condemn it. To Phostis, that was but another reason to look forward to it.
    The priest just shook his head. "How your grand cavalcade of those who love too well their riches shall progress concerns me not at all. I fear for your soul, lad, the only piece of you truly deserving of our care. Without a doubt you will abandon my teachings and return to your old corrupt ways, just as a moth seeks a flame or a fly, a cow turd."
    "I'll do no such thing," Phostis said indignantly. "I've discovered a great deal from you, holy sir, and would not think of turning aside from your golden words."
    "Ha!" Digenis said. "Do you see? Even your promises of piety betray the greed that remains yet in your heart. Golden words? To the ice with gold! Yet still it holds you in its honeyed grip, sticking you down so Skotos may seize you."
    "I'm sorry," Phostis said, humble now. "It was only a figure of speech. I meant no harm by it."
    "Ha!" Digenis repeated. "There are tests to see whether you have truly embraced piety or are but dissembling, perhaps even to yourself."
    "Give me one of those tests, then," Phostis said. "By the lord with the great and good mind, holy sir, I'll show you what I'm made of."
    "You are less easy to test than many might be. you know, lad," the priest said. At Phostis'