42. It is the same with love and wisdom, with the difference only that the substances and forms which are love and wisdom are not obvious to the eyes as are the organs of the external senses. Nevertheless, no-one can deny that those things of wisdom and love which are called thoughts, perceptions and affections are substances and forms, and not entities flying and flowing out of nothing, or abstracted from real and actual substance and form which are subjects. For in the brain are innumerable substances and forms in which resides every interior sense which pertains to the understanding and the will. All the affections, perceptions and thoughts there are not exhalations from those, but are actually and really subjects, emitting nothing from themselves, but merely undergoing changes according to whatever flows towards, and affects them. This can be established from the things stated above concerning the external senses. More will be said below about the things flowing towards, and affecting them.