...even supposing a man of unholy life were suffered to enter heaven, he would not be happy there; so that it would be no mercy to permit him to enter.

We are apt to deceive ourselves, and to consider heaven a place like this earth; I mean, a place where every one may choose and take his own pleasure. We see that in this world, active men have their own enjoyments, and domestic men have theirs; men of literature, of science, of political talent, have their respective pursuits and pleasures. Hence we are led to act as if it will be the same in another world. The only difference we put between this world and the next, is that here, (as we know well,) men are not always sure, but there, we suppose they will be always sure, of obtaining what they seek after. And accordingly we conclude, that any man, whatever his habits, tastes, or manner of life, if once admitted into heaven, would be happy there. [...] heaven, it is plain from Scripture, is not a place where many different and discordant pursuits can be carried on at once, as is the case in this world. Here every man can do his own pleasure, but there he must do God's pleasure. It would be presumption to attempt to determine the employments of that eternal life which good men are to pass in God's presence, or to deny that that state which eye hath not seen, nor ear heard, nor mind conceived, may comprise an infinite variety of pursuits and occupations. Still so far we are distinctly told, that that future life will be spent in God's presence, in a sense which does not apply to our present life; so that it may be best described as an endless and uninterrupted worship of the Eternal Father, Son, and Spirit. "They serve Him day and night in His temple, and He that sitteth on the throne shall dwell among them ... The Lamb which is in the midst of the throne shall feed them, and shall lead them unto living fountains of waters." Again, "The city had no need of the sun, neither of the moon to shine in it, for the glory of God did lighten it, and the Lamb is the light thereof. And the nations of them which are saved shall walk in the light of it, and the kings of the earth do bring their glory and honour into it." [Rev. vii. 15, 17; xxi. 23, 24.] These passages from St. John are sufficient to remind us of many others.

Heaven then is not like this world; I will say what it is much more like,—a church. For in a place of public worship no language of this world is heard; there are no schemes brought forward for temporal objects, great or small; no information how to strengthen our worldly interests, extend our influence, or establish our credit. These things indeed may be right in their way, so that we do not set our hearts upon them; still (I repeat), it is certain that we hear nothing of them in a church. Here we hear solely and entirely of God. We praise Him, worship Him, sing to Him, thank Him, confess to Him, give ourselves up to Him, and ask His blessing. And therefore, a church is like heaven; viz. because both in the one and the other, there is one single sovereign subject—religion—brought before us.

Supposing, then, instead of it being said that no irreligious man could serve and attend on God in heaven (or see Him, as the text expresses it), we were told that no irreligious man could worship, or spiritually see Him in church; should we not at once perceive the meaning of the doctrine? viz. that, were a man to come hither, who had suffered his mind to grow up in its own way, as nature or chance determined, without any deliberate habitual effort after truth and purity, he would find no real pleasure here, but would soon get weary of the place; because, in this house of God, he would hear only of that one subject which he cared little or nothing about, and nothing at all of those things which excited his hopes and fears, his sympathies and energies. If then a man without religion (supposing it possible) were admitted into heaven, doubtless he would sustain a great disappointment. Before, indeed, he fancied that he could be happy there; but when he arrived there, he would find no discourse but that which he had shunned on earth, no pursuits but those he had disliked or despised, nothing which bound him to aught else in the universe, and made him feel at home, nothing which he could enter into and rest upon. He would perceive himself to be an isolated being, cut away by Supreme Power from those objects which were still entwined around his heart. Nay, he would be in the presence of that Supreme Power, whom he never on earth could bring himself steadily to think upon, and whom now he regarded only as the destroyer of all that was precious and dear to him. Ah! he could not bear the face of the Living God; the Holy God would be no object of joy to him. "Let us alone! What have we to do with thee?" is the sole thought and desire of unclean souls, even while they acknowledge His majesty. None but the holy can look upon the Holy One; without holiness no man can endure to see the Lord.

When, then, we think to take part in the joys of heaven without holiness, we are as inconsiderate as if we supposed we could take an interest in the worship of Christians here below without possessing it in our measure. A careless, a sensual, an unbelieving mind, a mind destitute of the love and fear of God, with narrow views and earthly aims, a low standard of duty, and a benighted conscience, a mind contented with itself, and unresigned to God's will, would feel as little pleasure, at the last day, at the words, "Enter into the joy of thy Lord," as it does now at the words, "Let us pray." Nay, much less, because, while we are in a church, we may turn our thoughts to other subjects, and contrive to forget that God is looking on us; but that will not be possible in heaven.

We see, then, that holiness, or inward separation from the world, is necessary to our admission into heaven, because heaven is not heaven, is not a place of happiness except to the holy. There are bodily indispositions which affect the taste, so that the sweetest flavours become ungrateful to the palate; and indispositions which impair the sight, tinging the fair face of nature with some sickly hue. In like manner, there is a moral malady which disorders the inward sight and taste; and no man labouring under it is in a condition to enjoy what Scripture calls "the fulness of joy in God's presence, and pleasures at His right hand for evermore."

Nay, I will venture to say more than this;—it is fearful, but it is right to say it;—that if we wished to imagine a punishment for an unholy, reprobate soul, we perhaps could not fancy a greater than to summon it to heaven. Heaven would be hell to an irreligious man. We know how unhappy we are apt to feel at present, when alone in the midst of strangers, or of men of different tastes and habits from ourselves. How miserable, for example, would it be to have to live in a foreign land, among a people whose faces we never saw before, and whose language we could not learn. And this is but a faint illustration of the loneliness of a man of earthly dispositions and tastes, thrust into the society of saints and angels. How forlorn would he wander through the courts of heaven! He would find no one like himself; he would see in every direction the marks of God's holiness, and these would make him shudder. He would feel himself always in His presence. He could no longer turn his thoughts another way, as he does now, when conscience reproaches him. He would know that the Eternal Eye was ever upon him; and that Eye of holiness, which is joy and life to holy creatures, would seem to him an Eye of wrath and punishment. God cannot change His nature. Holy He must ever be. But while He is holy, no unholy soul can be happy in heaven. Fire does not inflame iron, but it inflames straw. It would cease to be fire if it did not. And so heaven itself would be fire to those, who would fain escape across the great gulf from the torments of hell. The finger of Lazarus would but increase their thirst. The very "heaven that is over their head" will be "brass" to them.

-John Henry Newman, Parochial and Plain Sermons, Sermon 1