The following are a series of lectures from Dr. James Dolezal on such doctrines as Divine simplicity, the unity of the Trinity, impassibility, immutibility, etc.

Divine Simplicity and the Grammar of Classical Christian Orthodoxy

Theistic Personalism and the Erosion of Classical Christian Theism

Divine Simplicity and Its Modern Detractors

Divine Eternity and the Challenge of Creation

Substantial Unity of the Father, Son, and Holy Spirit