"We have all along spoken of that which thinks, or mind, as so remarkably different, in its properties, from matter, as to present a ground of distinction quite sufficient for all the common purposes of life. We may even go further, and remark, that the philosophy of mind might be substantially conducted apart from any opinions as to the nature of mind itself; for this philosophy chiefly consists in the observation, the registry, the arrangement, the succession, and so far as it can be carried, the analysis of its various faculties, states, or phenomena."