John Henry Newman on religion that isn't

... Let us not then deceive ourselves; what God demands of us is to fulfil His law, or at least to aim at fulfilling it; to be content with nothing short of perfect obedience,—to attempt every thing,—to avail ourselves of the aids given us, and throw ourselves, not first, but afterwards on God's mercy for our short-comings. This is, I know, at first hearing a startling doctrine; and so averse are our hearts to it, that some men even attempt to maintain that it is an unchristian doctrine. A forlorn expedient indeed, with the Bible to refer to, and its statements about the strait gate and the narrow way. Still men would fain avail themselves of it, if they could; they argue that all enforcement of religion as a service or duty is erroneous, or what they call legal, and that no observance is right but what proceeds from impulse, or what they call the heart. They would fain prove that the law is not binding on us, because Christ has fulfilled it; or because, as is the case, faith would be accepted instead of obedience in those who had not yet had time to begin fulfilling it.

Such persons appeal to Scripture, and they must be refuted, as is not difficult, from Scripture; but the multitude of men do not take so much trouble about the matter. Instead of even professing to discover what God has said, they take what they call a common-sense view of it. They maintain it is impossible that religion should really be so strict according to God's design. They condemn the notion as over-strained and morose. They profess to admire and take pleasure in religion as a whole, but think that it should not be needlessly pressed in details, or, as they express it, carried too far. They complain only of its particularity, if I may use the term, or its want of indulgence and consideration in little things; that is, in other words, they like religion before they have experience of it,-in prospect,—at a distance,—till they have to be religious. They like to talk of it, they like to see men religious; they think it commendable and highly important; but directly religion comes home to them in real particulars of whatever kind, they like it not. It suffices them to have seen and praised it; they feel it a burden whenever they feel it at all, whenever it calls upon them to do what otherwise they would not do. In a word, the state of the multitude of men is this,—their hearts are going the wrong way; and their real quarrel with religion, if they know themselves, is not that it is strict, or engrossing, or imperative, not that it goes too far, but that it is religion. It is religion itself which we all by nature dislike, not the excess merely. Nature tends towards the earth, and God is in heaven. If I want to travel north, and all the roads are cut to the east, of course I shall complain of the roads. I shall find nothing but obstacles; I shall have to surmount walls, and cross rivers, and go round about, and after all fail of my end. Such is the conduct of those who are not bold enough to give up a profession of religion, yet wish to serve the world. They try to reach Babylon by roads which run to Mount Sion. Do you not see that they necessarily must meet with thwartings, crossings, disappointments, and failure? They go mile after mile, watching in vain for the turrets of the city of Vanity, because they are on the wrong road; and, unwilling to own what they are really seeking, they find fault with the road as circuitous and wearisome. They accuse religion of interfering with what they consider their innocent pleasures and wishes. But religion is a bondage only to those who have not the heart to like it, who are not cast into its mould. Accordingly, in the verse before the text, St. Paul thanks God that his brethren had "obeyed from the heart that form of teaching, into which they had been delivered." We Christians are cast into a certain mould. So far as we keep within it, we are not sensible that it is a mould, or has an outline. It is when our hearts would overflow in some evil direction, then we discover that we are confined, and consider ourselves in prison. It is the law in our members warring against the law of the Spirit which brings us into a distressing bondage. Let us then see where we stand, and what we must do. Heaven cannot change; God is "without variableness or shadow of turning." His "word endureth for ever in heaven." His law is from everlasting to everlasting. We must change. We must go over to the side of heaven. Never had a soul true happiness but in conformity to God, in obedience to His will. We must become what we are not; we must learn to love what we do not love, and practise ourselves in what is difficult. We must have the law of the Spirit of life written and set up in our hearts, "that the righteousness of the law may be fulfilled in us," and that we may learn to please and to love God.

John Henry Newman, The Strictness of the Law of Christ