What, then, are philosophy's four dimensions? Science gives us only partial knowledge and superficial understanding of the reality about which philosophy gives us a more penetrating analysis and a deeper understanding (Dimension One). Science gives us no knowledge or understanding of the good life and the good society. This moral and political philosophy gives us Dimension Two. Science gives us no understanding at all of the intelligible objects of thought - the great ideas (Dimension Three). It does not even enable us to understand science and history. This requires a philosophical understanding of all the intellectual disciplines and branches of learning (Dimension Four). The Four Dimensions of Philosophy not only explains why philosophy must be revived in the coming century, but it also throws light on what must be done to revive it, by overcoming all the obstacles to be found in philosophy's long past.