Before proceeding to answer this question, I must ask you to listen to some more psychological remarks. At our last lecture, I explained the shifting of men’s centres of personal energy within them and the lighting up of new crises of emotion. I explained the phenomena as partly due to explicitly conscious processes of thought and will, but as due largely also to the subconscious incubation and maturing of motives deposited by the experiences of life. When ripe, the results hatch out, or burst into flower. I have now to speak of the subconscious region, in which such processes of flowering may occur, in a somewhat less vague way. I only regret that my limits of time here force me to be so short.
The expression “field of consciousness” has but recently come into vogue in the psychology books. Until quite lately the unit of mental life which figured most was the single “idea” supposed to be a definitely outlined thing. But at present psychologists are tending, first, to admit that the actual unit is more probably the total mental state, the entire wave of consciousness or field of objects present to the thought at any time; and, second, to see that it is impossible to outline this wave, this field, with any definiteness.
As our mental fields succeed one another, each has its centre of interest, around which the objects of which we are less and less attentively conscious fade to a margin so faint that its limits are unassignable. Some fields are narrow fields and some are wide fields. Usually when we have a wide field we rejoice, for we then see masses of truth together, and often get glimpses of relations which we divine rather than see, for they shoot beyond the field into still remoter regions of objectivity, regions which we seem rather to be about to perceive than to perceive actually. At other times, of drowsiness, illness, or fatigue, our fields may narrow almost to a point, and we find ourselves correspondingly oppressed and contracted.