IV. This witness to the truth of christianity is certain and infallible, in the nature and reason of things; and where this divine life arises to a considerable height, it gives a full assurance to the christian, that his religion is true. Eternal life begun in the soul, according to the description of it, cannot rise from a _false_ doctrine; it must proceed from the God of truth, who himself is _eternal life_; 1 John v. 20. and the original and spring of it to all his happy creatures. If it were possible that any other doctrine or religion could work such an inward witness in the hearts of sinners; if it were possible that any mere human gospel could give such a life and happiness as I have described, God would never have appointed his own divine gospel such a doubtful witness. But I may say, God will never suffer so divine a testimony to belong to any religion, but that which himself hath revealed; and in our day it can belong to none but the gospel of our Lord Jesus Christ. If false religions could have this witness, could work this eternal life in sinners, we could hardly ever have sufficient rules to judge of the true religion by. Rejoice then ye that have found this witness in your souls, that have eternal life begun in you; seek after no other way to heaven. Be not drawn aside from the truth, but be stedfast. Ye cannot find such another doctrine among men; ye cannot find another religion that can offer such testimonies as this. It is then a convincing, an infallible witness; such a new and heavenly life wrought in the heart, is a sure proof that the doctrine comes from God. V. It is a strong and powerful witness, and ever ready at hand to baffle the most learned sophisms, and the boldest temptations. It lies so near, and is always at hand, that it is a present shield against every flying arrow from the camp of infidelity. It is an argument drawn from sense and vital experience, and it effectually answers all the subtle cavils of false reasoning. Suppose a crafty philosopher should pretend to prove, that bread is not wholesome, that water is useless to allay thirst, or wine is mere poison; I may boldly maintain the wholesomeness, and the happy use of bread, water, and wine; for I am daily nourished by this bread, my thirst has been perpetually quenched by water, and I have often found and felt this wine refresh me. The quibbles of logic, against the sense and experience of a true christian, are but as darts of straw and stubble against the scales of a leviathan.