Do you see the rock? Do you see the sand; how easily it sinks down, how it yields to calamities? How it is overthrown, though it have the support of royalty, of number, of nobility? For them that pursue it, it makes more senseless than all.
And it does not merely fall, but with great calamity: for “great indeed,” He says, “was the fall of it.” The risk not being of trifles, but of the soul, of the loss of Heaven, and those immortal blessings. Or rather even before that loss, no life so wretched as he must live that follows after this; dwelling with continual despondencies, alarms, cares, anxieties; which a certain wise man also was intimating when he said, “The wicked flees, when no man is pursuing.” For such men tremble at their shadows, suspect their friends, their enemies, their servants, such as know them, such as know them not; and before their punishment, suffer extreme punishment here. And to declare all this, Christ said, “And great was the fall of it;” shutting up these good commandments with that suitable ending, and persuading even by the things present the most unbelieving to flee from vice.
For although the argument from what is to come be vaster, yet is this of more power to restrain the grosser sort, and to withdraw them from wickedness. Wherefore also he ended with it, that the profit thereof might make its abode in them.
Conscious therefore of all these things, both the present, and the future, let us flee from vice, let us emulate virtue, that we may not labor fruitlessly and at random, but may both enjoy the security here, and partake of the glory there: unto which God grant we may all attain, by the grace and love towards man of our Lord Jesus Christ, to whom be the glory and the might forever and ever. Amen.
Source: Homilies on the Gospel of St. Matthew (New Advent)