Each of these divisions and sub-divisions has to be considered first as a part of Absolute Ethics and then as a part of Relative Ethics. Having seen what its injunctions must be for the ideal man under the implied ideal conditions, we shall be prepared to see how such injunctions are to be most nearly fulfilled by actual men under existing conditions. § 108. For reasons already pointed out, a code of perfect personal conduct can never be made definite. Many forms of life, diverging from one another in considerable degrees, may be so carried on in society as entirely to fulfill the conditions to harmonious co-operation. And if various types of men, adapted to various types of activities, may thus lead lives that are severally complete after their kinds, no specific statement of the activities universally required for personal well-being is possible. But, though, the particular requirements to be fulfilled for perfect individual well-being, must vary along with variations in the material conditions of each society, certain general requirements have to be fulfilled by the individuals of all societies. An average balance between waste and nutrition has universally to be preserved. Normal vitality implies a relation between activity and rest falling within moderate limits of variation. Continuance of the society depends on satisfaction of those primarily personal needs which result in marriage and parenthood. Perfection of individual life hence implies certain modes of action which are approximately alike in all cases, and which, therefore, become part of the subject matter of Ethics.