John Colquhoun’s A Treatise on the Law and the Gospel is a careful and pastorally grounded explanation of two themes that must be distinguished without being separated. The law exposes sin, declares God’s righteous demands and directs the believer’s obedience; the gospel reveals the saving work of Christ and freely promises life to those who receive Him by faith.

Writing within the Reformed covenantal tradition, Colquhoun considers the law as a covenant of works and as a rule of life, its administration at Sinai, and its relationship to the covenant of grace. He explains how believers are delivered from the law’s condemnation through Christ while remaining under a joyful obligation to obey God’s commands. These distinctions enable him to confront both legalism, which compromises the freeness of grace, and antinomianism, which diminishes the continuing place of God’s law.

Colquhoun’s treatment is theological but consistently practical. His purpose is not merely to define law and gospel, but to show how their proper relationship strengthens assurance, promotes holiness and keeps the Christian life centred upon Christ’s finished work.

First published by a Church of Scotland minister shaped by the theology of the Marrow tradition, this enduring work remains particularly valuable for pastors, theological students and readers interested in covenant theology and experiential Reformed doctrine. This hardcover edition includes a publisher’s introduction, study questions and a Scripture index.