There can be no question, then, of eluding human nature or of conceiving it and its environment in such a way as to stop its operation. We may take up our position in one region of experience or in another, we may, in unconsciousness of the interests and assumptions that support us, criticise the truth or value of results obtained elsewhere. Our criticism will be solid in proportion to the solidity of the unnamed convictions that inspire it, that is, in proportion to the deep roots and fruitful ramifications which those convictions may have in human life. Ultimate truth and ultimate value will be reasonably attributed to those ideas and possessions which can give human nature, as it is, the highest satisfaction. We may admit that human nature is variable; but that admission, if justified, will be justified by the satisfaction which it gives human nature to make it. We might even admit that human ideals are vain but only if they were nothing worth for the attainment of the veritable human ideal.
Origins inessential.
The given constitution of reason, with whatever a dialectical philosophy might elicit from it, obviously determines nothing about the causes that may have brought reason to its present pass or the phases that may have preceded its appearance. Certain notions about physics might no doubt suggest themselves to the moralist, who never can be the whole man; he might suspect, for instance, that the transitive intent of intellect and will pointed to their vital basis. Transcendence in operation might seem appropriate only to a being with a history and with an organism subject to external influences, whose mind should thus come to represent not merely its momentary state but also its constitutive past and its eventual fortunes. Such suggestions, however, would be extraneous to dialectical self-knowledge. They would be tentative only, and human nature would be freely admitted to be as variable, as relative, and as transitory as the natural history of the universe might make it.
Ideals functional.
The error, however, would be profound and the contradiction hopeless if we should deny the ideal authority of human nature because we had discovered its origin and conditions. Nature and evolution, let us say, have brought life to the present form; but this life lives, these organs have determinate functions, and human nature, here and now, in relation to the ideal energies it unfolds, is a fundamental essence, a collection of activities with determinate limits, relations, and ideals. The integration and determinateness of these faculties is the condition for any synthetic operation of reason. As the structure of the steam-engine has varied greatly since its first invention, and its attributions have increased, so the structure of human nature has undoubtedly varied since man first appeared upon the earth; but as in each steam-engine at each moment there must be a limit of mobility, a unity of function and a clear determination of parts and tensions, so in human nature, as found at any time in any man, there is a definite scope by virtue of which alone he can have a reliable memory, a recognisable character, a faculty of connected thought and speech, a social utility, and a moral ideal. On man's given structure, on his activity hovering about fixed objects, depends the possibility of conceiving or testing any truth or making any progress in happiness.
They are transferable to similar beings.
Thinkers of different experience and organisation have pro tanto different logics and different moral laws. There are limits to communication even among beings of the same race, and the faculties and ideals of one intelligence are not transferable without change to any other. If this historic diversity in minds were complete, so that each lived in its own moral world, a science of each of these moral worlds would still be possible provided some inner fixity or constancy existed in its meanings. In every human thought together with an immortal intent there is a mortal and irrecoverable perception: something in it perishes instantly, the part that can be materially preserved being proportionate to the stability or fertility of the organ that produced it. If the function is imitable, the object it terminates in will reappear, and two or more moments, having the same ideal, will utter comparable messages and may perhaps be unanimous. Unanimity in thought involves identity of functions and similarity in organs. These conditions mark off the sphere of rational communication and society; where they fail altogether there is no mutual intelligence, no conversation, no moral solidarity.
Authority internal.
The inner authority of reason, however, is no more destroyed because it has limits in physical expression or because irrational things exist, than the grammar of a given language is invalidated because other languages do not share it, or because some people break its rules and others are dumb altogether. Innumerable madmen make no difference to the laws of thought, which borrow their authority from the inward intent and cogency of each rational mind. Reason, like beauty, is its own excuse for being. It is useful, indeed, for living well, when to give reason satisfaction is made the measure of good.
The true philosopher, who is not one chiefly by profession, must be prepared to tread the winepress alone. He may indeed flourish like the bay-tree in a grateful environment, but more often he will rather resemble a reed shaken by the wind. Whether starved or fed by the accidents of fortune he must find his essential life in his own ideal. In spiritual life, heteronomy is suicide. That universal soul sometimes spoken of, which is to harmonise and correct individual demands, if it were a will and an intelligence in act, would itself be an individual like the others; while if it possessed no will and no intelligence, such as individuals may have, it would be a physical force or law, a dynamic system without moral authority and with a merely potential or represented existence. For to be actual and self-existent is to be individual. The living mind cannot surrender its rights to any physical power or subordinate itself to any figment of its own art without falling into manifest idolatry.
Reason autonomous.
Human nature, in the sense in which it is the transcendental foundation of all science and morals, is a functional unity in each man; it is no general or abstract essence, the average of all men's characters, nor even the complex of the qualities common to all men. It is the entelechy of the living individual, be he typical or singular. That his type should be odd or common is merely a physical accident. If he can know himself by expressing the entelechy of his own nature in the form of a consistent ideal, he is a rational creature after his own kind, even if, like the angels of Saint Thomas, he be the only individual of his species. What the majority of human animals may tend to, or what the past or future variations of a race may be, has nothing to do with determining the ideal of human nature in a living man, or in an ideal society of men bound together by spiritual kinship. Otherwise Plato could not have reasoned well about the republic without adjusting himself to the politics of Buddha or Rousseau, and we should not be able to determine our own morality without making concessions to the cannibals or giving a vote to the ants. Within the field of an anthropology that tests humanity by the skull's shape, there might be room for any number of independent moralities, and although, as we shall see, there is actually a similar foundation in all human and even in all animal natures, which supports a rudimentary morality common to all, yet a perfect morality is not really common to any two men nor to any two phases of the same man's life.
Its distribution.
The distribution of reason, though a subject irrelevant to pure logic or morals, is one naturally interesting to a rational man, for he is concerned to know how far beings exist with a congenial structure and an ideal akin to his own. That circumstance will largely influence his happiness if, being a man, he is a gregarious and sympathetic animal. His moral idealism itself will crave support from others, if not to give it direction, at least to give it warmth and courage. The best part of wealth is to have worthy heirs, and mind can be transmitted only to a