Originally published in 1692, Thomas Watson’s A Body of Divinity, also referred to as A Body of Practical Divinity, remains a highly recommended book that is a rich resource in teaching the fundamental doctrinal truths of Scripture. Drawing on the Westminster Shorter Catechism, “Watson conveys his thorough doctrinal and experimental knowledge of the truth in such an original, concise, pithy, pungent, racy, rich and illustrative style that he is rightly regarded as the most readable of the Puritans,” according to the Banner of Truth description of the book.
Charles Spurgeon said the following about it.
“Thomas Watson’s Body of Practical Divinity is one of the most precious of the peerless works of the Puritans; and those best acquainted with it prize it most. Watson was one of the most concise, racy, illustrative, and suggestive of those eminent divines who made the Puritan age the Augustan period of evangelical literature. There is a happy union of sound doctrine, heart-searching experience and practical wisdom throughout all his works, and his Body of Divinity is, beyond all the rest, useful to the student and the minister.”
Embedded below is a video featuring Dr. Steven Lawson who shares a testimonial about the impact Watson’s work had on his life and his understanding of the faith.
The text excerpted below is drawn from Watson’s opening chapter. It addresses what seems to perennially be the great need of the church – “to be settled in the doctrine of faith.” This excerpt also includes a valuable reminder about the many “seducers” that seek to persuade the believer off the narrow path and the “cheats” these malefactors of the faith employ in the effort.
’If ye continue in the faith grounded and settled.’ – Col 1:13.
It is the duty of Christians to be settled in the doctrine of faith. It is the apostle’s prayer, I Pet 5:50, ’The God of all grace stablish, strengthen, settle you.’ That is, that they might not be meteors in the air, but fixed stars. The apostle Jude speaks of ‘wandering stars, in verse 13. They are called wandering stars, because, as Aristotle says, ‘They do leap up and down, and wander into several parts of the heaven; and being but dry exhalations, not made of that pure celestial matter as the fixed stars are, they often fall to the earth.’ Now, such as are not settled in religion, will, at one time or other, prove wandering stars; they will lose their former steadfastness, and wander from one opinion to another. Such as are unsettled are of the tribe of Reuben, ‘unstable as water,’ Gen 49:9; like a ship without ballast, overturned with every wind of doctrine. Beza writes of one Belfectius, that his religion changed as the moon. The Arians had every year a new faith.
These are not pillars in the temple of God, but reeds shaken every way. The apostle calls them ‘damnable heresies.’ 2 Pet 2:2. A man may go to hell as well for heresy as adultery. To be unsettled in religion, argues want of judgement. If their heads were not giddy, men would not reel so fast from one opinion to another. It argues lightness. As feathers will be blown every way, so will feathery Christians. Triticum non rapit ventus inanes palae jactantur, Cyprian [Wheat that is not gathered, the wind blows into chaff.] Therefore such are compared to children. Eph 4:44. ‘That we be no more children, tossed to and fro.’ Children are fickle sometimes of one mind sometimes of another, nothing pleases them long; so unsettled Christians are childish; the truths they embrace at one time, they reject at another; sometimes they like the Protestant religion, and soon after they have a good mind to turn Papists.
It is the great end of the word preached, to bring us to a settlement in religion. Eph 4:41, 12, 14. ‘And he gave some, evangelists; and some, pastors and teachers; for the edifying of the body of Christ; that we henceforth be no more children.’ The word is called a hammer. Jer 23:39. Every blow of the hammer is to fasten the nails of the building; so the preacher’s words are to fasten you the more to Christ; they weaken themselves to strengthen and settle you. This is the grand design of preaching, not only for the enlightening, but for the establishing of souls; not only to guide them in the right way, but to keep them in it. Now, if you be not settled, you do not answer God’s end in giving you the ministry.
To be settled in religion is both a Christian’s excellence and honour. It is his excellence. When the milk is settled it turns to cream; now he will be zealous for the truth, and walk in close communion with God. And his honour. Prov 16:61. ‘The hoary head is a crown of glory, if it be found in the way of righteousness.’ It is one of the best sights to see an old disciple; to see silver hairs adorned with golden virtues.
Such as are not settled in the faith can never suffer for it. Sceptics in religion hardly ever prove martyrs. They that are not settled hang in suspense; when they think of the joys of heaven they will espouse the gospel, but when they think of persecution they desert it. Unsettled Christians do not consult what is best, but what is safest. ‘The apostate (says Tertullian) seems to put God and Satan in balance, and having weighed both their services, prefers the devil’s service, and proclaims him to be the best master: and, in this sense, may be said to put Christ to open shame.’ Heb 6:6. He will never suffer for the truth, but be as a soldier that leaves his colours, and runs over to the enemy’s side; he will fight on the devil’s side for pay.
Not to be settled in the faith is provoking to God. To espouse the truth, and then to fall away, brings an ill report upon the gospel, which will not go unpunished. Psa 78:87, 59. ‘They turned back, and dealt unfaithfully. When God heard this, he was wroth, and greatly abhorred Israel.’ The apostate drops as a wind-fall into the devil’s mouth.
If ye are not settled in religion, you will never grow. We are commanded ‘to grow up into the head, even Christ.’ Eph 4:15. But if we are unsettled there is no growing: ‘the plant which is continually removing never thrives.’ He can no more grow in godliness, who is unsettled, than a bone can grow in the body that is out of joint.
There is great need to be settled, because there are so many things to unsettle us. Seducers are abroad, whose work is to draw away people from the principles of religion. I John 2:26. ‘These things have I written unto you concerning them that seduce you.’
Seducers are the devil’s factors; they are of all others the greatest felons that would rob you of the truth. Seducers have silver tongues, that can put off bad wares; they have a sleight to deceive. Eph 4:14. The Greek word there is taken from those that can throw dice, and cast them for the best advantage. So seducers are impostors, they can throw a dice; they can so dissemble and sophisticate the truth, that they can deceive others.
Seducers deceive by wisdom of words. Rom 16:68. ‘By good words and fair speeches they deceive the hearts of the simple.’ They have fine elegant phrases, flattering language, whereby they work on the weaker sort. Another sleight is a pretence of extraordinary piety, that so people may admire them, and suck in their doctrine. They seem to be men of zeal and sanctity, and to be divinely inspired, and pretend to new revelations.
A third cheat of seducers is, labouring to vilify and nullify sound orthodox teachers. They would eclipse those that bring the truth, like black vapours that darken the light of heaven; they would defame others, that they themselves may be more admired. Thus the false teachers cried down Paul, that they might be received, Gal 4:17.
The fourth cheat of seducers is, to preach the doctrine of liberty; as though men are freed from the moral law, the rule as well as the curse, and Christ has done all for them, and they need to do nothing. Thus they make the doctrine of free grace a key to open the door to all licentiousness.
Another means is, to unsettle Christians by persecution. 2 Tim 3:12. The gospel is a rose that cannot be plucked without prickles. The legacy Christ has bequeathed is the CROSS. While there is a devil and a wicked man in the world, never expect a charter of exemption from trouble. How many fall away in an hour of persecution! Rev 12:2. ‘There appeared a great red dragon, having seven heads and ten horns; and his tail drew the third part of the stars of heaven.’ The red dragon, by his power and subtilty, drew away stars, or eminent professors, that seemed to shine as stars in the firmament of the church.
To be unsettled in good is the sin of the devils. Jude 6. They are called, ‘morning stars,’ Job 38:8, but ‘falling stars;’ they were holy, but mutable. As the vessel is overturned with the sail, so their sails being swelled with pride, they were overturned. I Tim 3:3. By unsettledness, men imitate lapsed angels. The devil was the first apostate. The sons of Sion should be like mount Sion, which cannot be removed.
… the way for Christians to be settled is to be well grounded. ‘If ye continue grounded and settled.’ The Greek word for grounded is a metaphor which alludes to a building that has the foundation well laid. So Christians should be grounded in the essential points of religion, and have their foundation well laid.
Here let me speak to two things:
 That we should be grounded in the knowledge of fundamentals. The apostle speaks of ‘the first principles of the oracles of God.’ Heb 5:12. In all arts and sciences, logic, physic, mathematics, there are some praecognita, some rules and principles that must necessarily be known for the practice of those arts; so, in divinity, there must be the first principles laid down. The knowledge of the grounds and principles of religion is exceedingly useful.
(I.) Else we cannot serve God aright. We can never worship God acceptably, unless we worship him regularly; and how can we do that, if we are ignorant of the rules and elements of religion? We are to give God a ‘reasonable service.’ Rom 12:2: If we understand not the grounds of religion, how can it be a reasonable service?
(2.) Knowledge of the grounds of religion much enriches the mind. It is a lamp to our feet; it directs us in the whole course of Christianity, as the eye directs the body. Knowledge of fundamentals is the golden key that opens the chief mysteries of religion; it gives us a whole system and body of divinity, exactly drawn in all its lineaments and lively colours; it helps us to understand many of those difficult things which occur in the reading of the word; it helps to untie many Scripture knots.
(3.) It furnishes us with armour of proof; weapons to fight against the adversaries of the truth.
(4.) It is the holy seed of which grace is formed. It is semen fidei, the seed of faith. Psa 9:10. It is radix amoris, the root of love. Eph 3:17. ‘Being rooted and grounded in love.’ The knowledge of principles conduces to the making of a complete Christian.
 This grounding is the best way to being settled: ‘grounded and settled.’ A tree, that it may be well settled, must be well rooted; so, if you would be well settled in religion, you must be rooted in its principles. We read in Plutarch of one who set up a dead man, and he would not stand. ‘Oh,’ said he, ‘there should be something within.’ So, that we may stand in shaking times, there must be a principle of knowledge within; first grounded, and then settled. That the ship may be kept from overturning, it must have its anchor fastened. Knowledge of principles is to the soul as the anchor to the ship, that holds it steady in the midst of the rolling waves of error, or the violent winds of persecution. First grounded and then settled.
See the reason why so many people are unsettled, ready to embrace every novel opinion, and dress themselves in as many religions as fashions; it is because they are ungrounded. See how the apostle joins these two together, ’unlearned and unstable.’ 2 Pet 3:16. Such as are unlearned in the main points of divinity are unstable.
As the body cannot be strong that has the sinews shrunk; so neither can that Christian be strong in religion who wants the grounds of knowledge, which are the sinews to strengthen and stablish him.
[Emphases above are added; Watson’s “Puritan English” and spelling have not been altered.]
[Contributed by Bud Ahlheim]