5 Wherefore Christ Himself exhorted, saying, “Give not that which is holy unto the dogs, neither cast your pearls before swine.” He called these words “pearls,” though in truth they be much more precious than they, because we have no substance more precious than that. For this reason too He is wont often to compare their sweetness to honey, not that so much only is the measure of their sweetness, but because among us there is nothing sweeter. Now, to show that they very exceedingly surpass the nature of precious stones, and the sweetness of any honey, hear the prophet speaking concerning them, and declaring this superiority; “More to be desired are they,” he says “than gold and much precious stone; sweeter are they also than honey and the honeycomb.” But to those (only) who are in health; wherefore he has added, “For your servant keeps them.” And again in another place calling them sweet he has added, “to my throat.” For he says, “How sweet are your words unto my throat.” And again he insists on the superiority, saying, “Above honey and the honeycomb to my mouth.” For he was in very sound health. And let not us either come near to these while we are sick, but when we have healed our soul, so receive the food that is offered us.
It is for this reason that, after so long a preface, I have not yet attempted to fathom these expressions (of St. John), in order that every one having laid aside all manner of infirmity, as though he were entering into heaven itself, so may enter here pure, and freed from wrath and carefulness and anxiety of this life, of all other passions. For it is not otherwise possible for a man to gain from hence anything great, except he have first so cleansed anew his soul. And let no one say that the time to the coming communion is short, for it is possible, not only in five days, but in one moment, to change the whole course of life. Tell me what is worse than a robber and a murderer, is not this the extremest kind of wickedness? Yet such an one arrived straight at the summit of excellence, and passed into Paradise itself, not needing days, nor half a day, but one little moment. So that a man may change suddenly, and become gold instead of clay. For since what belongs to virtue and to vice is not by nature, the change is easy, as being independent of any necessity. “If you be willing and obedient,” He says, “you shall eat the good of the land.” Do you see that there needs the will only? will— not the common wishing of the multitude— but earnest will. For I know that all are wishing to fly up to heaven even now; but it is necessary to show forth the wish by works. The merchant too wishes to get rich; but he does not allow his wish to stop with the thought of it; no, he fits out a ship, and gets together sailors, and engages a pilot, and furnishes the vessel with all other stores, and borrows money, and crosses the sea, and goes away into a strange land, and endures many dangers, and all the rest which they know who sail the sea. So too must we show our will; for we also sail a voyage, not from land to land, but from earth to heaven. Let us then so order our reason, that it be serviceable to steer our upward course, and our sailors that they be obedient to it, and let our vessel be stout, that it be not swamped amidst the reverses and despondencies of this life, nor be lifted up by the blasts of vainglory, but be a fast and easy vessel. If so we order our ship, and so our pilot and our crew, we shall sail with a fair wind, and we shall draw down to ourselves the Son of God, the true Pilot, who will not leave our bark to be engulfed, but, though ten thousand winds may blow, will rebuke the winds and the sea, and instead of raging waves, make a great calm.
Source: Homilies on the Gospel of John (New Advent)