Geomeasurements in Theory and Practice

The final test of a theory is its capacity to solve the problems which originated it.

During the period that began with classical Greece and ended with late pagan antiquity, philosophy was more than merely a theoretical discipline. Even when Aristotle identified philosophy with "theory," his purpose is to argue ... that a life of theoretical activity, the life of philosophy, was the best life that human beings could lead.

If you refuse to take account of theory, then you have forgotten that practice is often an offspring of theory.