I believe it to be a very notable lack in our theory of education that so little attempt is made to bring the will to bear upon what may be called the subconscious mind. It is that strange undercurrent of thought which is so imprudently neglected which throws up on its banks, without any apparent purpose or aim, the ideas and images which lurk within it. I do not say that such a training would immediately give self-control, but most peoples’ worst sufferings are caused by what is called “having something on their mind”; and yet, so far as I know, in the process of education, no attempt whatever is made, except quite incidentally, to dispossess the strong man armed by the stronger victor, or to help immature minds to hold an unpleasant or a pleasant thought at arm’s length, or to train them in the power of resolutely substituting a current of more wholesome images. The subconscious mind is too often treated as a thing beyond control, and yet the pathological power of suggestion, by which a thought is implanted like a seed in the mind, which presently appears to be rooted and flowering, ought to show us that we have within our reach an extraordinarily potent psychological implement.
So far then on the more negative side. I have indicated my strong belief that much may be done to train the mind in self-control. Indeed our whole education is built upon the faith that we can, perhaps not implant new faculties, but develop dormant ones; and I am persuaded that when future generations come to survey our methods and processes of education, they will regard with deep bewilderment the amazing fact that we applied so careful a training to other faculties, and yet left so helplessly alone the training of the imaginative faculty, upon which, as I have said, our happiness and unhappiness mainly depend. We must, all of us be aware of the fact that there have been times in our lives when all was prosperous, and when we were yet overshadowed with dreary thoughts; or again times when in discomfort, or under the shadow of failure, or at critical or tragic moments, we have had an unreasonable alertness and cheerfulness. All that is due to the subconscious mind, and we ought at least to try experiments in making it obey us better.