If you haven’t already done so, you should check out TGC’s Concise Theology series of short essays. It’s an impressive collection and should prove to be an excellent (free!) resource. I’ve already recommended several articles to people who have contacted me with theological questions. (Perhaps some generous donor would be willing to fund translations into Spanish, Mandarin, and Arabic?)
It struck me that a significant number of the essays were contributed by current and former professors at Reformed Theological Seminary, so I’ve taken the liberty of listing them here:
The Bible
- The Self-Attestation of Scripture and Internal Witness of the Holy Spirit (J. V. Fesko)
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The Biblical Canon (Michael J. Kruger)
- The Apocrypha (Michael J. Kruger)
The Church
- The Priesthood of All Believers (J. V. Fesko)
- The Mission of the Church (Kevin DeYoung)
Creation
- The Doctrine of Creation (Guy M. Richard)
End Times
- The Two Ages (Benjamin L. Gladd)
God
- The Eternality and Aseity of God (John M. Frame)
- The Omnipotence, Omniscience, and Omnipresence of God (John M. Frame)
- The Spirituality of God (John M. Frame)
- Divine Revelation: God Making Himself Known (John M. Frame)
- Divine Sovereignty and Human Freedom (John M. Frame)
- Divine Transcendence and Immanence (John M. Frame)
- God the Creator (John M. Frame)
- Openness Theology and Divine Omniscience (John M. Frame)
- The Sovereignty of God (John M. Frame)
- The Existence of God (James N. Anderson)
Salvation
- Justification and the New Perspective on Paul (Robert J. Cara)
- The Doctrine of Imputation (J. V. Fesko)
- The Doctrine of Saving Faith (J. V. Fesko)
- Redemption (Ligon Duncan)
- Propitiation (Ligon Duncan)
Sin
- Sin as Idolatry (Benjamin L. Gladd)
Systems and Methods of Theology
- Truth, Error, and Knowing (James N. Anderson)
- Analytic Theology (John M. Frame)
- Liberation Theology (John M. Frame)
- Narrative Theology (John M. Frame)
- Covenant Theology (Ligon Duncan)
Let me know if I missed any! (There may be some essays yet to be posted.)