11 But no one will always endure the strain; for fearful, truly fearful is the eager desire after this honor. And in saying this I am not in opposition to the blessed Paul, but in complete harmony with his words. For what says he? “If any man desires the office of a bishop, he desires a good work.” Now I have not said that it is a terrible thing to desire the work, but only the authority and power. And this desire I think one ought to expel from the soul with all possible earnestness, not permitting it at the outset to be possessed by such a feeling, so that one may be able to do everything with freedom. For he who does not desire to be exhibited in possession of this authority, does not fear to be deposed from it, and not fearing this will be able to do everything with the freedom which becomes Christian men: whereas they who fear and tremble lest they should be deposed undergo a bitter servitude, filled with all kinds of evils, and are often compelled to offend against both God and man. Now the soul ought not to be affected in this way; but as in warfare we see those soldiers who are noble-spirited fight willingly and fall bravely, so they who have attained to this stewardship should be contented to be consecrated to the dignity or removed from it, as becomes Christian men, knowing that deposition of this kind brings its reward no less than the discharge of the office. For when any one suffers anything of this kind, in order to avoid submitting to something which is unbecoming or unworthy of this dignity, he procures punishment for those who wrongfully depose him, and a greater reward for himself. “Blessed,” says our Lord, “are you when men shall revile you and persecute you, and shall say all manner of evil against you falsely for my sake; rejoice and be exceeding glad, for great is your reward in Heaven.” And this, indeed, is the case when any one is expelled by those of his own rank either on account of envy, with a view to the favor of others, or through hatred, or from any other wrong motive: but when it is the lot of any one to experience this treatment at the hand of opponents, I do not think a word is needed to prove what great gain they confer upon him by their wickedness.
It behooves us, then, to be on the watch on all sides, and to make a careful search lest any spark of this desire should be secretly smouldering somewhere. For it is much to be wished that those who are originally free from this passion, should also be able to avoid it when they have lighted upon this office. But if any one, before he obtains the honor, cherishes in himself this terrible and savage monster, it is impossible to say into what a furnace he will fling himself after he has attained it. Now I possessed this desire in a high degree (and do not suppose that I would ever tell you what was untrue in self-disparagement): and this, combined with other reasons, alarmed me not a little, and induced me to take flight. For just as lovers of the human person, as long as they are permitted to be near the objects of their affection, suffer more severe torment from their passion, but when they remove as far as possible from these objects of desire, they drive away the frenzy: even so when those who desire this dignity are near it, the evil becomes intolerable: but when they cease to hope for it, the desire is extinguished together with the expectation.
Source: On the Priesthood (New Advent)