The Argument from Affinity associates the soul with that which is divine, immortal, invisible, incomposite, and invariable. It also associates the body with that which is corporeal, mortal, visible, composite, and variable.

This argument takes the formal features of Forms (those properties a Form has by virtue of being a Form), as opposed to the proper features of Forms (those properties a particular Form has by virtue of being that particular Form). All Forms are of a certain type, and the soul is far more similar to this type than the body is.

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