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"They are related to justification not antecedently, efficiently and meritoriously, but consequently and declaratively. They are related to sanctification constitutively because they constitute and promote it. They are related to glorification antecedently and ordinatively because they are related to it as the means to the end; yea, as the beginning to the complement because
grace is glory begun, as glory is grace consummated.
Although we acknowledge the necessity of good works against the Epicureans, we do not on this account confound the law and the gospel and interfere with gratuitous justification by faith alone. Good works are required not for living according to the law, but because we live by the gospel; not as the causes on account of which life is given to us, but as effects which testify that life has been given to us.
Believers are a willing people who ought not to be impelled to good works by necessity (ex
arumches) (viz., by a necessity of compulsion), but spontaneously and voluntarily
(hekousios). But still, works do not cease to be necessary by the necessity of means and of debt. Although all coaction is necessity, not all necessity is coaction. The calumnies wont to be drawn against the necessity of good works from our doctrine concerning perserverance and the certainty of faith have been discussed in Topic XV, Questions 16 and 17."
FRANCIS TURRETIN,
Institutes of Elenctic Theology, vol. 2, n.d.