The instinct of congruity, of subordination of part to whole, the desire for harmony which is fostered above all things by art, is one of the most precious parts of our nature, if only, obeying its own tendency to expand, we apply it to ever wider circles of being; not merely to the accessories of living, but to life itself. For this love of harmony and order leads us to seek what is most necessary in our living: a selection of the congruous, an arrangement of the mutually dependent in our thoughts and feelings. Much of the work of the universe is done, no doubt, by what seems the exercise of mere random energy, by the thinking of apparently disconnected thoughts and the feeling of apparently sporadic impulses; but if the thought and the impulse remained really disconnected and sporadic, half would be lost and half would be distorted. It is one of the economical adaptations of nature that every part of us tends not merely to be consistent with itself, to eliminate the hostile, to beget the similar, but tends also to be connected with other parts; so that, action coming in contact with action, thought in contact with thought, and feeling in contact with feeling, each single one will be strengthened or neutralised by the other. And it is the especial business of what we may call the central consciousness, the dominant thought or emotion, to bring these separate thoughts and impulses, these separate groups thereof, into more complex relations, to continue on a far vaster scale that vital contact, that trying of all things by the great trial of affinity or repulsion, of congruity or incongruity. Thus we make trial of ourselves; and by the selfsame process, by the test of affinity and congruity, the silent forces of the universe make trial of _us_, rejecting or accepting, allowing us, our thoughts, our feelings to live and be fruitful, or condemning us and them to die in barrenness. Whither are we going? In what shape shall the various members of our soul proceed on their journey; which forming the van, which the rear and centre? Or shall there be neither van, nor rear, nor wedge-like forward flight? If this question remains unasked or unanswered, our best qualities, our truest thoughts and purest impulses, may be hopelessly scattered into distant regions, become defiled in bad company, or, at least, barren in isolation; the universal life rejecting or annihilating them.