Second, The capacity that we are in, who act and do from the heavenly principle; it is that of sons, the sons of God by adoption, as the apostle said, 'Because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father' (Gal 4:6). And again, 'As many as are led by the Spirit of God, they are the sons of God' (Rom 8:14). This is a far other than is your human description of acting as a creature, endued with a principle of reason; for here is a man acts as a son, endued with the Holy Spirit of God, who hath, before the world was, predestinated him to this estate, by Jesus Christ, to himself (Eph 1:4, 4:6). As a son therefore, the Christian acts and does, because he is endued with that high and heavenly principle mentioned before; by which principle this man hath received a new heart, a new spirit, a new understanding, a good conscience, so made by 'faith in the blood of the Lord Jesus' (Heb 10). Thus being made again anew and another man, he acts from a new and another principle than yours; a principle as far beyond and above you, as is a man above a brute, and as is grace above nature (2 Col 5:14-16).
Third, As the Christian acts and does from a better principle, and under a better capacity or consideration than that you have described; so (to allude to your own notion) the first principles by which they receive this spirit and adoption, are not those principles of morals, or those originally dictates of human nature; but it is through the hearing of faith (Gal 3:1-3), by which we understand, that the Son of God became a man, died for our sins, hath saved us from the curse of God, and accounted us to be the righteousness of God in him; this being heard with the gospel, and a New Testament hearing, the Holy Ghost forthwith possesseth us, by the glorious working whereof we are helped, through the Son, to call the God of heaven, our Father.
Now thus being made free from sin, by the only faith of Jesus Christ, 'we have our fruit unto holiness, and the end everlasting life' (Rom 6:22).
And here come in those reasonable conclusions, which you would make the very radicals of Christianity, they being only remote, and after conclusions, drawn from the fore-mentioned mercy of God, viz., from predestination, calling, adoption, and justification by Christ's blood, while we in ourselves are sinners. I say these are the things which Paul endeavoured to provoke the Romans, Philippians, and Colossians, to an holy conversation by.
To the Romans, 'I beseech you therefore,' saith he, 'by the mercies of God, (What mercies? Why those of election, redemption, calling, justification, and adoption, mentioned in the foregoing chapters) that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service' (Rom 12:1).
To the Philippians, 'If there be therefore any consolation in Christ, if any comfort of love, if any fellowship of the Spirit, if any bowels and mercies, fulfil ye my joy, that ye be like minded' (Phil 2:1,2).
To the Colossians, 'If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God; set your affection on things above, not on things on the earth; for ye are dead, and your life is hid with Christ in God. When Christ, who is our life, shall appear, then shall ye also appear with him in glory' (Col 3:1-4). Now mark; mortify therefore, therefore! wherefore? why, because they were risen with Christ; because they should appear at the end of this world with Christ himself in glory; therefore mortify the deeds of the body, or our members that are upon the earth.
These Sir, are the motives by which we Christians act; because we are forgiven, because we are sons, and if sons, then heirs, and so we act; but to speak to this more anon.
Perhaps you will say I deal not fairly with you, because you treat, as of moral, so of gospel or New Testament laws.
But to that I will answer at present, that in this description of your holy principle, which is the foundation of your book, whether the laws be natural or spiritual, moral or of grace, the principle by which you do them, is no other than the principle of nature, the dictates of the human nature; and so such as can by no means reach the doctrines of the gospel any farther than to make a judgment of them, by that wisdom which is 'enmity with God,' as will farther be seen in my progress through your book.