James Allen (1864-1912) was one of the pioneers of the New Thought movement, the primary aim of which was to fuse the principles of psychology, philosophy, and religion into a protocol that could be applied to everyday life. Allen's works, in particular the celebrated treatise on the power of thought, As a Man Thinketh, have become established classics of motivational literature and have provided the foundation material for many programs in the self-help industry.
When a man enters a dark room, he is not sure of his movements; he cannot see objects around him or properly locate them and is liable to hurt himself by coming into sudden contact with them. But let a light be introduced, and immediately all confusion disappears. Every object is seen, and there is no danger of being hurt. To the majority, life is such a dark room, and their frequent hurts - their disappointments, perplexities, sorrows, and pains - are caused by sudden contact with principles that they do not see.