Plato claims that the human soul or mind can know, think about, and mentally deal with ideal concepts that are not material, not visible, unchanging, and eternal. He concludes that the soul or mind...

Plato claims that the human soul or mind can know, think about, and mentally deal with ideal concepts that are not material, not visible, unchanging, and eternal. He concludes that the soul or mind must therefore have these same characteristics. What assumption does Plato make to move from what he claims to what he concludes? Do you think this assumption is true? Why?