Thought is a wave of the mind. The difference between thought and imagination is that the former is an activity of the mind directed with intention, and imagination is an activity which is not directed intentionally but rises mechanically, like the waves of the sea. Therefore imagination has less power than thought. No doubt the imagination of a man with a powerful mind will also have an influence and an outcome; but thought, intentionally directed, has strength of will with it, and therefore its power is great.