HKB
Now to place an obstacle to a thing amounts to the same as refusing it altogether. Therefore it would seem that one may, without sin, refuse the episcopal office absolutely.
On the contrary, Augustine says (Ep. xlviii ad Eudox.): "If Mother Church requires your service, neither accept with greedy conceit, nor refuse with fawning indolence"; and afterwards he adds: "Nor prefer your ease to the needs of the Church: for if no good men were willing to assist her in her labor, you would seek in vain how we could be born of her."
I answer that, Two things have to be considered in the acceptance of the episcopal office: first, what a man may fittingly desire according to his own will; secondly, what it behooves a man to do according to the will of another. As regards his own will it becomes a man to look chiefly to his own spiritual welfare, whereas that he look to the spiritual welfare of others becomes a man according to the appointment of another having authority, as stated above (A. 1, ad 3). Hence just as it is a mark of an inordinate will that a man of his own choice incline to be appointed to the government of others, so too it indicates an inordinate will if a man definitively refuse the aforesaid office of government in direct opposition to the appointment of his superior: and this for two reasons.
First, because this is contrary to the love of our neighbor, for whose good a man should offer himself according as place and time demand: hence Augustine says (De Civ. Dei xix, 19) that "the demands of charity undertake an honest labor." Secondly, because this is contrary to humility, whereby a man submits to his superior's commands: hence Gregory says (Pastor. i, 6): "In God's sight humility is genuine when it does not obstinately refuse to submit to what is usefully prescribed."
Reply Obj. 1: Although simply and absolutely speaking the contemplative life is more excellent than the active, and the love of God better than the love of our neighbor, yet, on the other hand, the good of the many should be preferred to the good of the individual. Wherefore Augustine says in the passage quoted above: "Nor prefer your own ease to the needs of the Church," and all the more since it belongs to the love of God that a man undertake the pastoral care of Christ's sheep. Hence Augustine, commenting on John 21:17, "Feed My sheep," says (Tract. cxxiii in Joan.): "Be it the task of love to feed the Lord's flock, even as it was the mark of fear to deny the Shepherd."
Moreover prelates are not transferred to the active life, so as to forsake the contemplative; wherefore Augustine says (De Civ. Dei xix, 19) that "if the burden of the pastoral office be imposed, we must not abandon the delights of truth," which are derived from contemplation.