  A crucial role in Spinoza’s system is played by 2P7 and its scholium, since they lay the ground for solving, or rather dissolving, the mind–body problem. Therefore, the understanding of the nature of the union of mind and body depends on one’s interpretation of Spinoza’s theory of attributes and 2P7 and its scholium in particular. (For a discussion of the issues regarding the union of Mind and Body, see  Section 1.9.4). The interpretation of the metaphysical structure of what is expressed in 2P7 and its scholium is affected greatly by the number of attributes one believes there are in Spinoza’s system and how one understands the relation between the attributes and the substance. The general description of 2P7 and its scholium is discussed above in  Section 1.6.