Religious Affections is Jonathan Edwards’s great attempt to answer one question: how can you tell the difference between real faith and a convincing imitation of it? He published it in 1746, after years of revival had swept New England and then subsided, leaving behind a crowd of people who had wept, trembled, and made professions — and a hard question about how many of them had actually been changed. It is Edwards’s most careful book, and probably the most searching study of the human heart ever written by an American.
This guide explains why he wrote it, what its three parts argue, the famous list of signs that prove nothing, the twelve marks of true grace, and how to read a book that many people start and few finish. The full text is free in the Ochorus library.
Why Edwards wrote it
Edwards was the minister at Northampton, at the centre of the Great Awakening, and he had watched it up close — including in his own church, where hundreds professed conversion. He was a friend of revival; he had defended it in print against critics who dismissed the whole thing as emotional excess. But he had also seen the aftermath. Some who had cried out under preaching were plainly, permanently changed. Others had been just as loud, and a year later were exactly as they had been before, or worse. Edwards had preached Sinners in the Hands of an Angry God and seen the room shaken; now he wanted to know who among the shaken had actually been saved.
He refused the two easy answers. One party said the emotion was the proof: if people wept and shook, God was at work. The other said emotion was the problem: real religion was calm and rational, and all this feeling was delusion. Edwards thought both were wrong, and he built the book to say why. His thesis is stated in the first pages, drawn from 1 Peter 1:8, where Peter describes Christians who love a Christ they have not seen and rejoice with joy unspeakable:
True religion, in great part, consists in holy affections.
Jonathan Edwards, Religious Affections
Part One: religion is not less than feeling
The first part defends the affections. By affections Edwards does not quite mean emotions in our sense; he means the inclinations of the soul, the deep movements of the will toward or away from things. He defines them plainly:
The affections are no other than the more vigorous and sensible exercises of the inclination and will of the soul.
Jonathan Edwards, Religious Affections
His argument is that God made us with these inclinations precisely so that we would love him with them. A religion that never moves the heart is no religion at all. Deuteronomy 6:5 commands love to God with all the heart and soul and might; Romans 12:11 tells Christians to be fervent in spirit. Edwards points out that Scripture makes fear, hope, love, joy, and holy sorrow central to true faith, and that the deadest thing in the world is a person who knows about God and feels nothing. So he will not let the calm-and-rational party win. Whatever true religion is, it is not indifference.
Part Two: the twelve signs that prove nothing
Then Edwards turns, and this is the part that unsettles every reader. Having defended feeling, he spends the whole second part listing things that look like grace and are not evidence either way. Twelve of them. Religious affections may be very high and intense — and that proves nothing, because false affections can be intense too. They may have great effects on the body, making people cry or faint — and that proves nothing. They may make people fluent and eager to talk about religion, may come with texts of Scripture rushing to mind, may arrive in a convincing order of conviction then comfort, may dispose people to spend much time in worship and to praise God with their mouths — and none of it proves anything.
The most disturbing item on the list is the eleventh: affections may make people exceedingly confident that their experience is divine and that they are saved — and that is no sign either. Edwards knew that false assurance is often louder than the true kind. The whole section is a cold shower, and it is meant to be. He is dismantling every external test people use to reassure themselves, because he has watched those tests fail. Matthew 7:22–23 stands behind the entire part: many will say, Lord, Lord, and be told, I never knew you.
Part Three: the twelve marks of true grace
Only then does Edwards say what the real signs are. There are twelve of these too, and they are inward and moral rather than external and measurable. A few carry the weight of the rest.
True affections arise from the beauty of divine things themselves, not from what those things do for me. The counterfeit loves God for his gifts and his heaven; the real thing has seen that God is lovely in himself, and would love him for that alone. This is the sense of God’s excellency that Edwards described in his sermon A Divine and Supernatural Light — a spiritual taste, given by the Spirit, for the holiness of God.
They come with a change of nature. Real grace does not leave a person where it found them. 2 Corinthians 5:17 is the mark: if anyone is in Christ, there is a new creation. They produce the temper of Christ — the lamblike, dovelike spirit of love, meekness, and forgiveness, which Edwards takes from Matthew 11:29. They soften the heart rather than hardening it into pride. They increase spiritual hunger rather than satisfying it; the more a true saint has, the more they long for, which is Psalm 42:1, the deer panting for water.
And then the twelfth, which Edwards makes the summit of the book: true affections issue in Christian practice. They change how a person actually lives, especially under trial, over the long run. He calls it, in a phrase worth remembering:
Christian practice is the sign of signs, in this sense, that it is the great evidence which confirms and crowns all other signs of godliness.
Jonathan Edwards, Religious Affections
This is not works-righteousness; Edwards is as clear as anyone that we are saved by grace through faith, as Ephesians 2:8–9 says. His point is about evidence, not cause. The fruit does not make the tree good, but by their fruits you shall know them, as Matthew 7:20 has it. A changed life is not what saves you; it is how you and everyone else can tell that you have been saved.
Why the book still matters
Edwards was writing about the eighteenth century, but the problem he addresses is permanent, and arguably sharper now. Every era of vivid religious experience produces the same aftermath: a body of people who felt something powerful and then went back to living exactly as before. Modern churches know the pattern well — the emotional high of a conference or a worship set, the raised hands and the tears, followed by an unchanged Monday. Edwards is not against the feeling; he insists on it. He is against mistaking the feeling for the reality. His book is the most rigorous tool ever built for telling the two apart, and it works as well on a stadium as on a colonial meeting-house.
It also protects against the opposite error, which is just as common: the cold, correct believer who has decided that because emotion can be counterfeit, emotion must be suspect, and who has quietly settled into a religion of the head with a dead heart. Edwards will not allow that either. Revelation 3:15–16 warns the lukewarm church that God would rather it were hot or cold than tepid. The book cuts both ways at once, which is why it has never gone out of use, and why pastors on every side of every revival argument still reach for it.
What to weigh as you read
Two cautions. First, the book can be crushing if read carelessly, because Part Two takes away every comfort before Part Three gives the real one back. A reader who stops in the middle can conclude that no one can be sure of anything. That is not Edwards’s view; he believed assurance was possible and good, but that it rests on grace bearing fruit, not on the intensity of an experience. Read to the end.
Second, Edwards writes in long eighteenth-century sentences, and the argument is fine-grained. This is not a book to race. It is a book to read a section at a time, slowly, with your own heart in view — which is exactly how he meant it to be used. He was not writing about other people’s religion. He was handing his readers a lamp to search their own, as Psalm 139:23–24 asks God to do: search me, and know my heart.
How to read it today
Read the introduction and Part One first, and take the thesis to heart. Before the hard part, let Edwards convince you that God wants your heart engaged, not anaesthetised.
Read Part Two humbly, not anxiously. The point is not to make you despair but to loosen your grip on false props. Let it do that work.
Give Part Three the most time. The twelve marks reward slow reading, and the last one — Christian practice — is where the whole book has been going.
Read A Divine and Supernatural Light beside it. That short sermon is the positive heart of Edwards: the sense of God’s beauty that the Spirit gives. It shows you what the true affection Edwards keeps pointing to actually feels like.
Then read Sinners in the Hands of an Angry God again. Once you have read the Affections, you understand why Edwards preached as he did, and why he then spent a book making sure that no one mistook mere fright for grace.
Edwards ends where he began: real religion moves the heart, and the moved heart shows itself in a changed life. James 1:22 says to be doers of the word and not hearers only. The whole of Religious Affections is that verse, examined until it becomes a mirror.