§ 4. By philosophic minds, however, the ‘Morality of Common Sense’ (as I have ventured to call it), even when made as precise and orderly as possible, is often found unsatisfactory as a system, although they have no disposition to question its general authority. It is found difficult to accept as scientific first principles the moral generalities that we obtain by reflection on the ordinary thought of mankind, even though we share this thought. Even granting that these rules can be so defined as perfectly to fit together and cover the whole field of human conduct, without coming into conflict and without leaving any practical questions unanswered,--still the resulting code seems an accidental aggregate of precepts, which stands in need of some rational synthesis. In short, without being disposed to deny that conduct commonly judged to be right is so, we may yet require some deeper explanation _why_ it is so. From this demand springs a third species or phase of Intuitionism, which, while accepting the morality of common sense as in the main sound, still attempts to find for it a philosophic basis which it does not itself offer: to get one or more principles more absolutely and undeniably true and evident, from which the current rules might be deduced, either just as they are commonly received or with slight modifications and rectifications.[90] The three phases of Intuitionism just described may be treated as three stages in the formal development of Intuitive Morality: we may term them respectively Perceptional, Dogmatic, and Philosophical. The last-mentioned I have only defined in the vaguest way: in fact, as yet I have presented it only as a problem, of which it is impossible to foresee how many solutions may be attempted: but it does not seem desirable to investigate it further at present, as it will be more satisfactorily studied after examining in detail the Morality of Common Sense. It must not be thought that these three phases are sharply distinguished in the moral reasoning of ordinary men: but then no more is Intuitionism of any sort sharply distinguished from either species of Hedonism. A loose combination or confusion of methods is the most common type of actual moral reasoning. Probably most moral men believe that their moral sense or instinct in any case will guide them fairly right, but also that there are general rules for determining right action in different departments of conduct: and that for these again it is possible to find a philosophical explanation, by which they may be deduced from a smaller number of fundamental principles. Still for systematic direction of conduct, we require to know on what judgments we are to rely as ultimately valid.