Abstract
On the occasion of the 50th anniversary of Herman Dooyeweerd’s New Critique of Theoretical Thought in 1985 and the 10th anniversary of his death in 1987, I explore his theory of theory. Dooyeweerd distinguished theory as conceptual knowledge of abstracted functions from everyday knowing as integrated knowledge of wholes. He tried to show that critical theorizing requires philosophical integration, self-awareness, and religious knowledge of the origin of ourselves and creation. In the course of developing his view Dooyeweerd touched on many issues that are still current for us today, in particular issues around foundationalism. A brief evaluation in the context of our contemporary philosophical scene closes the essay.