4. That he pursue his investigations with _implicit confidence in the distinct affirmations of his own consciousness in respect to this subject_. Such a suggestion would appear truly singular, if made in respect to any other department of mental science but that of the Will. Here it is imperiously called for so long have philosophers and divines been accustomed to look without, to determine the characteristics of phenomena which appear exclusively within, and which are revealed to the eye of consciousness only. Having been so long under the influence of this pernicious habit, it will require somewhat of an effort for the mind to turn its organ of self-vision in upon itself, for the purpose of correctly reporting to itself, what is really passing in that inner sanctuary. Especially will it require an effort to do this, with a fixed determination to abandon all theories formed from external observation, and to follow implicitly the results of observations made internally. This method we must adopt, however, or there is at once an end of all real science, not only in respect to the Will, but to all other departments of the mind. Suppose an individual to commence a treatise on _colors_, for example, with a denial of the validity of all affirmations of the Intelligence through the eye, in respect to the phenomena about which he is to treat. What would be thought of such a treatise? The moment we deny the validity of the affirmations of any of our faculties, in respect to the appropriate objects of those faculties, all reasoning about those objects becomes the height of absurdity. So in respect to the mind. If we doubt or deny the validity of the affirmations of consciousness in respect to the nature and characteristics of all mental operations, mental philosophy becomes impossible, and all reasoning in respect to the mind perfectly absurd. Implicit confidence in the distinct affirmations of consciousness, is a fundamental law of all correct philosophizing in every department of mental science. Permit me most earnestly to bespeak this confidence, as we pursue our investigations in respect to the Will. COMMON FAULT.