11 Let none then introduce the things of earth into heaven; let no one standing here be careful about what is at his house. For he ought to bear with him, and to preserve both at home and in his business, what he gains from this place, not to allow it to be loaded with the burdens of house and market. Our reason for entering in to the chair of instruction is, that thence we may cleanse ourselves from the filth of the outer world; but if we are likely even in this little space to be injured by things said or done without, it is better for us not to enter at all. Let no one then in the assembly be thinking about domestic matters, but let him at home be stirring with what he heard in the assembly. Let these things be more precious to us than any. These concern the soul, but those the body; or rather what is said here concerns both body and soul. Wherefore let these things be our leading business, and all others but occasional employments; for these belong both to the future and the present life, but the rest neither to the one nor the other, unless they be managed according to the law laid down for these. Since from these it is impossible to learn not only what we shall hereafter be, and how we shall then live, but how we shall rightly direct this present life also.
For this house is a spiritual surgery, that whatever wounds we may have received without, here we may heal, not that we may gather fresh ones to take with us hence. Yet if we do not give heed to the Spirit speaking to us, we shall not only fail to clear ourselves of our former hurts, but shall get others in addition.
Let us then with much earnestness attend to the book as it is being unfolded to us; since if we learn exactly its first principles and fundamental doctrines, we shall not afterwards require much close study, but after laboring a little at the beginning, shall be able, as Paul says, to instruct others also. For this Apostle is very sublime, abounding in many doctrines, and on these he dwells more than on other matters.
Let us not then be careless hearers. And this is the reason why we set them forth to you little by little, so that all may be easily intelligible to you, and may not escape your memory. Let us fear then lest we come under the condemnation of that word which says, “If I had not come and spoken unto them, they had not had sin.” For what shall we be profited more than those who have not heard, if even after hearing we go our way home bearing nothing with us, but only wondering at what has been said.
Allow us then to sow in good ground; allow us, that you may draw us the more to you. If any man has thorns, let him cast the fire of the Spirit among them. If any has a hard and stubborn heart, let him by employing the same fire make it soft and yielding. If any by the wayside is trodden down by all kind of thoughts, let him enter into more sheltered places, and not lie exposed for those that will to invade for plunder: that so we may see your cornfields waving with grain. Besides, if we exercise such care as this over ourselves, and apply ourselves industriously to this spiritual hearing, if not at once yet by degrees, we shall surely be freed from all the cares of life.
Let us therefore take heed that it be not said of us, that our ears are those of a deaf adder. For tell me, in what does a hearer of this kind differ from a beast? And how could he be otherwise than more irrational than any irrational animal, who does not attend when God is speaking? And if to be well-pleasing to God is really to be a man, what else but a beast can he be who will not even hear how he may succeed in this? Consider then what a misfortune it would be for us to fall down of our own accord from (the nature of) men to (that of) beasts, when Christ is willing of men to make us equal to angels. For to serve the belly, to be possessed by the desire of riches, to be given to anger, to bite, to kick, become not men, but beasts. Nay, even the beasts have each, as one may say, one single passion, and that by nature. But man, when he has cast away the dominion of reason, and torn himself from the commonwealth of God's devising, gives himself up to all the passions, is no longer merely a beast, but a kind of many-formed motley monster; nor has he even the excuse from nature, for all his wickedness proceeds from deliberate choice and determination.
May we never have cause to suspect this of the Church of Christ. Indeed, we are concerning you persuaded of better things, and such as belong to salvation; but the more we are so persuaded, the more careful we will be not to desist from words of caution. In order that having mounted to the summit of excellencies, we may obtain the promised goods. Which may it come to pass that we all attain to, through the grace and lovingkindness of our Lord Jesus Christ, by whom and with whom, to the Father and the Holy Ghost, be glory world without end. Amen.
Source: Homilies on the Gospel of John (New Advent)