Biblically speaking, holding philosophical beliefs that contain internally self-refuting contradictions is an expression of irrationalism. It can also be a case of inexcusable ignorance. Ultimately, all non-Christian philosophy starts with bold rationalistic assertions about reality and ends up in irrationalism. The philosophy of logical positivism is one example. The positivist philosophy can be described as empiricism (all knowledge comes through sensations) with a vengeance. This positivist philosophy is a vengeance against all metaphysical statements. A popular contemporary form of empiricism that derives from John Locke is known as the theory that the mind at birth is a blank tablet (tabula rasa) and then assimilates knowledge through sensations. This theory could be called the