Further, there is nothing to hinder us from taking the stones of the sanctuary to be those of which the sanctuary was itself constructed; which lie scattered in the top of the streets when men in sacred orders, in whose office the glory of holiness had previously seemed to stand, devote themselves out of preference to earthly doings. Secular employments, therefore, though they may sometimes be endured out of compassion, should never be sought after out of affection for the things themselves; lest, while they weigh down the mind of him who loves them, they sink it, overcome by its own burden, from heavenly places to the lowest.
But, on the other hand, there are some who undertake the care of the flock, but desire to be so at leisure for their own spiritual concerns as to be in no wise occupied with external things. Such persons, in neglecting all care for what pertains to the body, by no means meet the needs of those who are put under them. And certainly their preaching is for the most part despised; because, while they find fault with the deeds of sinners, but nevertheless afford them not the necessaries of the present life, they are not at all willingly listened to.
For the word of doctrine penetrates not the mind of one that is in need, if the hand of compassion commends it not to his heart. But the seed of the word readily germinates, when the loving-kindness of the preacher waters it in the hearer's breast. Whence, for a ruler to be able to infuse what may profit inwardly, it is necessary for him, with blameless consideration, to provide also for outward things. Let pastors, then, so glow with ardour in regard to the inward affections of those they have the charge of as not to relinquish provision also for their outward life.
For, as we have said, the heart of the flock is, even as it were of right, set against preaching, if the care of external succour be neglected by the pastor. Whence also the first pastor anxiously admonishes, saying, The elders which are among you I beseech, who am also an elder, and a witness of the sufferings of Christ, and also a partaker of the glory that shall be revealed, feed the flock of God which is among you: in which place he showed whether it was the feeding of the heart or of the body that he was commending, when he immediately added, Providing for it, not by constraint, but willingly, according to God, not for filthy lucre, but of a ready mind. In these words, indeed, pastors are kindly forewarned, lest, while they satisfy the want of those who are under them, they slay themselves with the sword of ambition; lest, while through them their neighbours are refreshed with succours of the flesh, they themselves remain fasting from the bread of righteousness.
This solicitude of pastors Paul stirs up when he says, If any provide not for his own, and especially for those of his own house, he has denied the faith, and is worse than an infidel. In the midst of all this, then, they should fear, and watchfully take heed, lest, while occupied with outward care, they be whelmed away from inward intentness. For usually, as we have already said, the hearts of rulers, while unwarily devoting themselves to temporal solicitude, cool in inmost love; and, being carried here and there abroad, fear not to forget that they have undertaken the government of souls.
It is necessary, then, that the solicitude expended on those who are put under us should be kept within a certain measure. Hence it is well said to Ezekiel, The priests shall not shave their heads, nor suffer their locks to grow long, but polling let them poll their heads. For they are rightly called priests who are set over the faithful for affording them sacred guidance. But the hairs outside the head are thoughts in the mind; which, as they spring up insensibly above the brain, denote the cares of the present life, which, owing to negligent perception, since they sometimes come forth unseasonably, advance, as it were, without our feeling them.
Since, then, all who are over others ought indeed to have external anxieties, and yet should not be vehemently bent upon them, the priests are rightly forbidden either to shave their heads or to let their hair grow long; that so they may neither cut off from themselves entirely thoughts of the flesh for the life of those who are under them, nor again allow them to grow too much. Thus in this passage it is well said, Polling let them poll their heads; to wit, that the cares of temporal anxiety should both extend themselves as far as need requires, and yet be cut short soon, lest they grow to an immoderate extent.
When, therefore, through provident care for bodies applied externally life is protected [or, through provident care applied externally the life of bodies is protected], and again, through moderate intentness of heart, is not impeded, the hairs on the priest's head are both preserved to cover the skin, and cut short so as not to veil the eyes.
Source: Pastoral Rule (New Advent)