A Westminster Divine on Sanctification and Salvation
Below are the words of Westminster Assembly divine Obadiah Sedgwick, using language strikingly similar to Calvin’s (among many others) about the necessity of good works for eternal life, within a treatise flooded with the controlling importance of union with Christ. Note particularly his sensitivity to the danger that pardon might be equated illegitimately with salvation:
The Reasons why God doth promise these two great Gifts of holiness and forgiveness; to sanctifie his people as well as to justify them. There may be these Reasons for their Connexion. First, Both of them have a necessary respect to the salvation of the people of God: A man must be justified if he will be saved; and a man must be sanctified if he will be saved; he cannot be saved without both: he cannot be saved unless he be justified: [Rom. 8:30]… None are justified but such as are called, and none are glorified but such as are justified: [Mark 16:16]… He cannot be saved unless he be sanctified: [John 3:5]… [Heb. 12:14]… Here you see a necessity of both of them in reference to salvation; we many times think that if our sins are pardoned, there needed no more to save us, but we are deceived; for as forgiveness is necessary, so is holiness necessary to salvation; as no unpardoned person, so no unsanctified person shall be saved.
(From my Life in Christ, p. 266.)
 Obadiah Sedgwick, The Bowels of Tender Mercy Sealed in the Everlasting Covenant, wherein Is set forth the Nature, Conditions and Excellencies of it, and how a Sinner should do to enter it, and the danger of refusing this Covenant-Relation. Also the Treasures of Grace, Blessings, Comforts, Promises and Priviledges that are comprized in the Covenant of Gods Free and Rich Mercy made in Jesus Christ with Believers (London: by Edward Mottershed for Adoniram Byfield, 1661), 490.