[6] Fourth: _Those who believe in instantaneous salvation and unmediated mercy do not know that affections, which are of the will, are nothing other than changes of state in the purely organic substances of the mind; that thoughts, which are of the understanding, are nothing other than changes and variations in the form of those substances; and that memory is the persisting state of the changes and variations._ Everyone acknowledges, on its being said, that affections and thoughts exist only in substances and their forms, which are the subjects; existing in the brain which is full of substances and forms, they are called purely organic forms. No one who thinks rationally can help laughing at the fancies of some that affections and thoughts do not have substantive bases, but are exhalations given shape by heat and light, like images apparently in the air or ether. For thought can no more exist apart from a substantial form than sight can apart from its form, the eye, or hearing apart from its form, the ear, or taste apart from its form, the tongue. If you examine the brain, you will see innumerable substances and fibres, also, and see, too, that everything in it is organized. What more is needed than this ocular proof? [7] But one may ask, What are affection and thought then? A conclusion can be reached from each and all things in the body. In it are many viscera, each fixed in its place, and all performing their several functions by changes and variations of state and form. It is well known that they are engaged in their own activities--the stomach, the intestines, the kidneys, the liver, the pancreas, the spleen, the heart and the lungs, each in its particular activity. All the activities are maintained from within, and to be actuated from within means that it is by changes and variations of state and form. It may be plain then that the activities of the purely organic substances of the mind are similar, the one difference being that those of the organic substances of the body are natural, but of the mind are spiritual; plainly, also, the two make one by correspondences.