These works are freely available online. The editions linked below are from trusted digital archives.

  • John Calvin — Commentary on Hebrews

    The primary Reformed exposition of the letter. Calvin’s pastoral concern for growth and maturity runs through every chapter.

    Christian Classics Ethereal Library (ccel.org)

  • John Calvin — Institutes of the Christian Religion, Book III

    Chapters 1–10 treat union with Christ, faith, repentance, and sanctification — the doctrinal foundation of everything on this site.

    CCEL.org · or the McNeill/Battles edition (Westminster John Knox)

  • Robert Rollock — Select Works

    Rollock’s covenant theology and practical divinity. The Wodrow Society edition is in the public domain.

    Internet Archive (archive.org)

  • David Dickson — Therapeutica Sacra

    A searching work on conscience, assurance, and the evidences of saving grace — essential reading for trained discernment.

    Internet Archive (archive.org)

  • George Gillespie — Aaron’s Rod Blossoming

    The classic defense of Presbyterian church government and discipline as ordained means of congregational maturity.

    Internet Archive (archive.org)

  • The Westminster Standards

    Confession of Faith, Larger and Shorter Catechisms, Directory for Public Worship, Form of Presbyterian Church Government.

    Westminster Confession of Faith with Proof Texts — RPCNA edition (opc.org/documents)

These are in print and available from the Banner of Truth Trust and other Reformed publishers.

  • Samuel Rutherford — Letters

    The richest treasury of experimental piety in the Scottish tradition. Banner of Truth edition includes all 365 letters.

  • John Owen — The Mortification of Sin

    “Be killing sin, or it will be killing you.” The most practically searching Puritan treatment of sanctification.

  • John Owen — Communion with God

    How the believer enjoys distinct fellowship with each Person of the Trinity. Nourishment of the most solid kind.

  • James Durham — Christ Crucified

    72 sermons on Isaiah 53. Experimental Christocentricity of the highest order.

  • Sinclair Ferguson — The Whole Christ

    A modern engagement with the Marrow Controversy — on grace, law, antinomianism, and the free offer of the gospel.

  • Monergism.com — Sanctification Collection

    The largest free online collection of Reformed articles, sermons, and books on sanctification and growth.

  • Banner of Truth Trust (banneroftruth.org)

    The primary publisher of classic Reformed and Puritan works in modern editions. Essential reading lists and free articles.

  • RPCNA.com — Westminster Standards

    The Reformed Presbyterian Church of North America hosts carefully formatted texts of all Westminster documents.

  • SermonAudio.com — Scottish and RPCNA Preaching

    Search for preachers in the Reformed Presbyterian and OPC traditions. Solid food from faithful pulpits across the world.