This book conceives philosophy in terms of philosophising as an active process. The intention of the argument is to restore philosophy to its origins as an ethos, a practice, a way of living for rational beings. Philosophy is therefore presented more as a practice or an activity than as an intellectual exercise or subject discipline. Philosophy is something that one does as a rational being. This is not an invitation to sloppy thinking; it is an invitation to all to philosophize as rational beings. A questioning, critical approach grounded in the rational faculty is taken to be the most salient characteristic of philosophy. This emphasises intelligence and its application over knowledge. Philosophy is not a question of knowledge but of the application of intelligence. The book proceeds from Socrates as the key figure in this conception of philosophy as philosophizing. Socrates was no ivory tower philosopher but took philosophy to the men and women of ‘the real world’ in an attempt to get them to support their views and activities with arguments, with good reasons for doing, thinking, stating the things they did. The ‘real world’ is not the one revealed to ordinary sense experience. This book shows that only by philosophizing can individuals enter the real world.