In the next book I shall take up the practical consequences that follow from the theory here advanced. Having delineated the ethical ideal, and discovered the invaluable fact that there is a structural plan contained in it, we shall see that our actual human duties may be derived by applying this ideal scheme to the quasi-organic groups already existing in human society. There are provocative correspondences to the ethical ideal in the social life of men; otherwise it would be impossible to apply it. There are human groups in which a quasi-correlative membership in a common life already exists. In the case of each of these groups we find some sort of empirical multiplicity which must be studied scientifically, and also an empirical motive which may be utilized in the interest of developing the ethical relation. The family is the first of these groups which offers a footing in the world of experience for the ideal. In the family natural affection is the motive; in the vocational group, the desire to express a talent or special gift; in the state, patriotism; in the church, the need felt to integrate all human ideals. Thus the things of earth are to be used as instrumentalities by which we are to become aware of the spiritual reality. Only that the disparateness of the physical world and the ethical universe should ever be kept in the foreground. Every effort to solve the riddle by somehow identifying the two has failed. To account for the existence of a finite world of indefinite extensibility side by side with a universe _ex hypothesi_ infinite is impossible. Instead of seeking to explain let effort go toward utilizing. Let the _world_ be used instrumentally for the purpose of verifying the existence of _universe_. For the average man, and indeed for all men, the test of the truth of a theory is in the practice to which it leads. Abstract metaphysical arguments appeal only to a few, and even for them the formula in its abstract guise is unconvincing. Look at the mathematical figure, and see whether the axioms hold good. Look at the sequent phenomena and see whether the so-called law of nature is exemplified. And so with respect to conduct: look at the ways of human behavior traced out in accordance with the plan of the ethical manifold, and see whether such behavior wins the approval of the spiritual nature implicit within you.[38] NOTE I There are various points at which the system sketched in the text deviates from current opinion, but in regard to the underlying proposition the reader’s particular attention is called to the remarks on the “prejudice of causality” and to the statement that verification is exemplification.