First, We may know it in the nature of it. That is, that it is love free, divine, heavenly, everlasting, incorruptible. And this no love is but the love of Christ; all other love is either love corruptible, transient, mixed, or earthly. It is divine, for 'tis the love of the holy nature of God. It is heavenly, for that it is from above: it is everlasting, for that it has no end: it is immortal, for that there is not the appearance of corruptibleness in it, or likelihood of decay.
This is general knowledge, and this is common among the saints, at leastwise in the notion of it. Though I confess, it is hard in time of temptation, practically to hold fast the soul to all these things. But, as I have said already, this love of Christ must be such, because love in the root of it, is essential to his nature, as also I have proved now, as is the root, such are the branches; and as is the spring, such are the streams, unless the channels in which those streams do run, should be corrupted, and so defile it; but I know no channels through which this love of Christ is conveyed unto us, but those made in his side, his hands, and his feet, &c. Or those gracious promises that dropped like honey from his holy lips, in the day of his love, in which he spake them: and seeing his love is conveyed to us, as through those channels, and so by the conduit of the holy and blessed spirit of God, to our hearts, it cannot be that it should hitherto be corrupted. I know the cisterns, to wit, our hearts, into which it is conveyed, are unclean, and may take away much, through the damp that they may put upon it, of the native savour and sweetness thereof. I know also, that there are those that tread down, and muddy those streams with their feet (Eze 34:18,19); but yet neither the love nor the channels in which it runs, should bear the blame of this. And I hope those that are saints indeed, will not only be preserved to eternal life, but nourished with this that is incorruptible unto the day of Christ. I told you before, that in the hour of temptation, it will be hard for the soul to hold fast to these things; that is, to the true definition of this love; for then, or at such seasons, it will not be admitted that the love of Christ is either transient, or mixed; but we count that we cannot be loved long, unless something better than yet we see in us, be found there, as an inducement to Christ to love, and to continue to love our poor souls (Isa 64:6). But these the Christian at length gets over; for he sees, by experience, he hath no such inducement (Deu 9:5); also, that Christ loves freely, and not for, or because of such poor, silly, imaginary enticements (Eze 16:60-62). Thus therefore the love of Christ may be known, that is, in the nature of it: it may, I say, but not easily (Eze 36:25-33). For this knowledge is neither easily got, though got, nor easily retained, though retained. There is nothing that Satan setteth himself more against, than the breaking forth of the love of Christ in its own proper native lustre. For he knows it destroys his kingdom, which standeth in profaneness, in errors and delusions, the only destruction of which is the knowledge of this love of Christ (2 Cor 5:14). What mean those swarms of opinions that are in the world? what is the reason that some are carried about as clouds, with a tempest? what mean men's waverings, men's changing, and interchanging truth for error, and one error for another? why, this is the thing, the devil is in it. This work is his, and he makes this ado, to make a dust; and a dust to darken the light of the gospel withal. And if he once attaineth to that, then farewell the true knowledge of the love of Christ.
Also he will assault the spirits of Christians with divers and sundry cogitations, such as shall have in them a tendency to darken the judgment, delude the fancy, to abuse the conscience. He has an art to metamorphose all things. He can make God seem to be to us, a most fierce and terrible destroyer; and Christ a terrible exactor of obedience, and most amazingly pinching of his love. He can make supposed sins unpardonable; and unpardonable ones, appear as virtues. He can make the law to be received for gospel, and cause that the gospel shall be thrown away as a fable. He can persuade, that faith is fancy, and that fancy is the best faith in the world. Besides, he can tickle the heart with false hope of a better life hereafter, even as if the love of Christ were there. But, as I said before, from all these things the true love of Christ in the right knowledge of it, delivereth those that have it shed abroad in the heart by the Holy Ghost that he hath given (Rom 5). Wherefore it is for this purpose that Christ biddeth us to continue in his love (John 15:9); because the right knowledge, and faith of that to the soul, disperseth and driveth away all such fogs, and mists of darkness; and makes the soul to sit fast in the promise of eternal life by him; yea, and to grow up into him who is the head, "in all things."
Before I leave this head, I will present my reader with these things, as helps to the knowledge of the love of Christ. I mean the knowledge of the nature of it, and as HELPS to retain it.
Help First, Know thy self, what a vile, horrible, abominable sinner thou art: For thou canst not know the love of Christ, before thou knowest the badness of thy nature. "O wretched man that I am" (Rom 7:24), must be, before a man can perceive the nature of the love of Christ. He that sees himself but little, will hardly know much of the love of Christ: he that sees of himself nothing at all, will hardly ever see anything of the love of Christ. But he that sees most of what an abominable wretch he is, he is like to see most of what is the love of Christ. All errors in doctrine take their rise from the want of this (I mean errors in doctrine as to justification). All the idolizing of men's virtues, and human inventions, riseth also from the want of this. So then if a man would be kept sure and stedfast, let him labour before all things to know his own wretchedness. People naturally think that the knowledge of their sins is the way to destroy them; when in very deed, it is the first step to salvation. Now if thou wouldest know the badness of thy self, begin in the first place to study the law, then thy heart, and so thy life. The law thou must look into, for that's the glass; thy heart thou must look upon, for that's the face; thy life thou must look upon, for that's the body of a man, as to religion (James 1:25). And without the wary consideration of these three, 'tis not to be thought that a man can come at the knowledge of himself, and consequently to the knowledge of the love of Christ (James 1:26,27).
Help Second, Labour to see the emptiness, shortness, and the pollution that cleaveth to a man's own righteousness. This also must in some measure be known, before a man can know the nature of the love of Christ. They that see nothing of the loathsomeness of man's best things, will think, that the love of Christ is of that nature as to be procured, or won, obtained or purchased by man's good deeds. And although so much gospel light is broke forth as to stop men's mouths from saying this, yet 'tis nothing else but sound conviction of the vileness of man's righteousness, that will enable men to see that the love of Christ is of that nature, as to save a man without it; as to see that it is of that nature as to justify him without it: I say, without it, or not at all. There is shortness, there is hypocrisy, there is a desire of vain glory, there is pride, there is presumption in man's own righteousness: nor can it be without these wickednesses, when men know not the nature of the love of Christ. Now these defile it, and make it abominable. Yea, if there were no imperfection in it, but that which I first did mention, to wit, shortness; how could it cover the nakedness of him that hath it, or obtain for the man, in whole or in part, that Christ should love, and have respect unto him.
Occasions many thou hast given thee to see the emptiness of man's own righteousness, but all will not do unless thou hast help from heaven: wherefore thy wisdom will be, if thou canst tell where to find it, to lie in the way of God, that when he comes to visit the men that wait upon him in the means of his own appointing, thou mayest be there; if perhaps he may cast an eye of pity upon thy desolate soul, and make thee see the things above mentioned. That thou mayest know the nature of the love of Christ.
Help Third, If thou wouldest know the nature of this love, be much in acquainting of thy soul with the nature of the law, and the nature of the gospel (Gal 3:21). The which though they are not diametrically opposite one to another, yet do propound things so differently to man, that if he knows not where, when, and how to take them, 'tis impossible but that he should confound them, and in confounding of them, lose his own soul (Rom 9:31,32). The law is a servant, both first and last, to the gospel (Rom 10:3,4): when therefore it is made a Lord, it destroyeth: and then to be sure it is made a Lord and Saviour of, when its dictates and commands are depended upon for life.
Thy wisdom therefore will be to study these things distinctly, and thoroughly; for so far as thou art ignorant of the true knowledge of the nature of these, so far thou art ignorant of the true knowledge of the nature of the love of Christ. Read Paul to the Galatians, that epistle was indicted by the Holy Ghost, on purpose to direct the soul, in, and about this very thing.
Help Fourth, The right knowledge of the nature of the love of Christ, is obtained, and retained, by keeping of these two doctrines at an everlasting distance as to the conscience; to wit, not suffering the law to rule but over my outward man, not suffering the gospel to be removed one hair's breadth from my conscience. When Christ dwells in my heart by faith (Eph 3:17), and the moral law dwells in my members (Col 3:5), the one to keep up peace with God, the other to keep my conversation in a good decorum: then am I right, and not till then.