1. explain how two so dissimilar substances can relate to each other 2. explain how mind can know reality if reality is so utterly unlike mind and its ideas. Berkelean idealism overcomes the doubt that our ideas correctly represent the world. But of course he couldn t talk about it for, as that which underlies qualities, it is devoid of them. But matter, stripped of all qualities, cannot be experienced. Therefore it is inconceivable.
Primary qualities are therefore inconceivable apart from secondary qualities.
Yet if secondary qualities are subjective, primary qualities must be also. Hence they are perceptions in the mind, just like secondary qualities. The first, lengthy segment of this dialog that Miller reproduces repeats the above five criticisms of dualism, albeit in inverse order. The concluding section points up the presumption of common sense in favor of Berkeley s position. Berkeley believed that such a view would immediately strike one as the most commonsensical , once the reasoning is followed and our built-in prejudices about matter are laid aside.