ABSTRACT
The concept of human will, the correct interpretation of which is essential to the subject of this treatise, implies a twofold meaning. Since all mental action involves thinking. Natural will is the psychological equivalent of the human body, or the principle of the unity of life, supposing that life is conceived under that form of reality to which thinking itself belongs. The activities of the vegetative or organic will are conditioned by general stimuli received or experienced (material stimuli); those of the animal will by perceptions or visible impressions (sensory or motor stimuli), those of mental will by thoughts or verbal sensations. Self-criticism is the highest or most intellectual form of rational will, conscience the highest or most intellectual form of natural will. The substance of rational will is freedom in so far as it is present in the individual's mind as the total of possibilities or forces of volition or nonvolition, action and nonaction.
