Why so?
Why, 'That they which have believed in God, might be careful to maintain good works.' The meaning is, that the way to provoke others to good works, is constantlyin the evidence and demonstration of the spiritto show them the certainty of their [these believers] being by grace made heirs of eternal life.
From this scripture, therefore, I do gather these things observable.
FIRST, That good works do flow from faith. Yea,
SECOND, That every one that believeth should be careful that their works be good.
THIRD, That every believer should not only be careful that their works be good, and for the present do them, but should also be careful to maintain them; that is, they should carefully study to keep in a constant course of good works.
FOURTH, and lastly, That the best way to provoke both ourselves and others to this work, it is to be often affirming to others the doctrine of justification by grace, and to believe it ourselves: 'This is a faithful saying, and these things I will,' saith Paul, 'that thou affirm constantly, that they which have believed in God might be careful to maintain good works.'
FIRST. I begin with the first. That good works do flow from faith.
This is evident divers ways.
First, From the impossibility of their flowing from any other thing; they must either flow from faith, or not at all: 'For whatsoever is not of faith, is sin' (Rom 14:23). And again, 'Without faith it is impossible to please him' (Heb 11:6). Every man by nature, before faith, is an evil and a corrupt tree; and a corrupt tree cannot bring forth good fruit: 'Do men gather grapes of thorns, or figs of thistles?' (Matt 7:16,17). Now a man is made good by faith, and by that bringeth forth the fruits that are acceptable to God (Heb 11:4; Col 1:4-6).
Wherefore sinners, before faith, are compared to the wilderness, whose fruits are briars and thorns; and whose hearts are the habitation of dragons; that is, of devils 4 (Isa 35:6,7; Heb 6:7,8).