St. John when he wrote his Gospel, it was for this end, That they might be∣lieve, John 20.31. For though believing be already wrought, yet they that do believe had need to believe more, the Word is the mighty power of God to lead believers from faith to faith, Rom. 1.17. that is, from one degree of faith to another, Phil 1.25 as that is not only faith, but increase of faith, so 1 Thess. 3.10. there is not any of Gods servants, even the most exemplary Christians, but there is some defect in their faith, which had need to be supply∣ed, and this may be the first reason.
Reas. 1. Taken from the defects that are found in believers, the supply whereof they had need to increase and grow up to. 1 They had need to grow up to the belief of some principles which they believed not before, and this is a defect in the objects of faith; many of the Apostles believed not the Resurrection of Christ; nay Thomas said, he should not believe, ex∣cept he should see the print of his nayles, John 20.25. So many of the Corinths believed not the Resurrection from the dead, a main Article of Faith: the Thessalonians lacked this in their Faith, they thought Christ would then have come suddenly, and therefore began to lay aside all care in their out∣ward callings, which Paul informs them in, 2 Thess. 2. The Galatians are wanting in believing justification by faith, and therefore Paul writes that E∣pistle to them.
2. There is something wanting in the habit, or in the grace of faith, therefore the Apostle prays for the Colossians, that they might be rooted and establish∣ed in the faith, Col. 2.7. even as a young plant may be so weak, that the least rub may root it up; so a Christian may have some rooting in Christ, and yet want sound rootednesse and firmnesse of faith, there may be a want of that confidence and full assurance that is required.
3 Faith may be wanting in the sense of it, for a Christian may have at∣tained to a great measure of lively faith, and yet be in doubt whether he have any true faith or not; now that we may be assured of it, he had need to be built up in faith; as the poor man said to Christ, Lord I believe, help mine unbelief, he believed, and yet knew not well whether he should call it faith, or unbelief, therefore Phil. 1.25. Paul trusted that he should continue with them for the furtherance and joy of their faith; now so long as a Christian is doubtful of his faith, he hath little joy or comfort in it, therefore they had need to be brought on further, that their faith may be a joyful faith.
4 Faith had need to be increased in regard of the acts of it, which are perswasion and trust on Christ, those had need to be increased. Peter when he walked on the water, he was perswaded Christ would save him, but when the winds began to be boysterous, he was afraid and began to sink, but Christ reacheth forth his hand to help him, and reproves him, O thou of little faith, Matth. 14.30, 31. The two Disciples that went to Emaus, and were talking of Christs death, they said one to another, We trusted it had been he that should have delivered Israel, we so trusted, but now are afraid we are deceived, for they looked that the Messias should abide for ever, but what saith Christ to them? O fools and slow of heart to believe, so that faith had need to increase in the acts of it.
5 Faith had need to grow in the fruits of it, though faith may be of some strength and comfort, yet it may be much wanting in the fruits of it; one fruit of faith is love, Gal. 5.6. Now a Christian may leave his first love, and so far, that withall he may lose his first works, Revel. 2.2, 3. there∣fore