Liberal theology drew heavily on the philosophies of Kant and another nineteenth-century Christian thinker, G. W. F. Hegel. Without reducing Christian sources and norms to natural reason or general revelation in nature or philosophy, liberal Christian thinkers did tend to elevate “the best of modern thought and human experience” to the status of a source and norm of Christian belief equal in weight with special divine revelation in Scripture. One of the most representative liberal theologians of the modern world was German church historian Adolf Harnack, who gave a series of lectures in Berlin
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