Look at this quote from Westminster about Good Works. It's the same from London. That good works are evidence of a lively faith. Enabled by the Spirit of Christ. That the end of their good works is eternal life.
CHAPTER 16
Of Good Works
1. Good works are only such as God hath commanded in his holy Word, and not such as, without the warrant thereof, are devised by men, out of blind zeal, or upon any pretense of good intention.
2. These good works, done in obedience to God's commandments, are the fruits and evidences of a true and lively faith: and by them believers manifest their thankfulness, strengthen their assurance, edify their brethren, adorn the profession of the gospel, stop the mouths of the adversaries, and glorify God, whose workmanship they are, created in Christ Jesus thereunto, that, having their fruit unto holiness, they may have the end, eternal life.
3. Their ability to do good works is not at all of themselves, but wholly from the Spirit of Christ. And that they may be enabled thereunto, beside the graces they have already received, there is required an actual influence of the same Holy Spirit, to work in them to will, and to do, of his good pleasure: yet are they not hereupon to grow negligent, as if they were not bound to perform any duty unless upon a special motion of the Spirit; but they ought to be diligent in stirring up the grace of God that is in them.
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But their view of works cannot be properly understood without first trting to nail them down on the nature of faith.
And in their view, Faith = faithfulness.
They don't define faith as simply trusting in Jesus to save them, it includes commitment to Him or it's not real faith.