II. The broad road is crowded, the narrow way of salvation nearly empty
And thus is perfectly fulfilled that assurance of the Truth, by which we learn that “narrow and steep is the way that leads to life;” and while the breadth of the way that leads to death is crowded with a large company, the steps are few of those that tread the path of safety. And wherefore is the left road more thronged than the right, save that the multitude is prone to worldly joys and carnal goods? And although that which it desires is short-lived and uncertain, yet men endure toil more willingly for the lust of pleasure than for love of virtue.
Thus while those who crave things visible are unnumbered, those who prefer the eternal to the temporal are hardly to be found. And, therefore, seeing that the blessed Apostle Paul says, “the things which are seen are temporal, but the things which are not seen are eternal,” the path of virtue lies hid and in concealment, to a certain extent, since “by hope we were saved,” and true faith loves that above all things, which it attains to without any intervention of the flesh. A great work and toil it is then to keep our wayward heart from all sin, and, with the numberless allurements of pleasure to ensnare it on all sides, not to let the vigour of the mind give way to any attack.
Who “touches pitch, and is not defiled thereby?” who is not weakened by the flesh? Who is not begrimed by the dust? Who, lastly, is of such purity as not to be polluted by those things without which one cannot live? For the Divine teaching commands by the Apostle's mouth that “they who have wives” should “be as though they had none: and those that weep as though they wept not; and those that rejoice as though they rejoiced not; and those that buy as though they possessed not; and those that use this world as though they used it not; for the fashion of this world passes away.”
Blessed, therefore, is the mind that passes the time of its pilgrimage in chaste sobriety, and loiters not in the things through which it has to walk, so that, as a stranger rather than the possessor of its earthly abode, it may not be wanting in human affections, and yet rest on the Divine promises.
Source: Sermons (New Advent)