Principles Of Human Knowledge - pg. 48

For Berkeley, there can be no veil of perception. Real things cannot be hidden behind appearances, since appearances (ideas of sense) are real things. What is more, there are no unaswerable questions about what qualities real things can have, all sensible qualities having been taken away from them. For the sensible qualities are all there is to real things. There is no difficulty about conceiving how reality is in itself, or which of its apparent qualities are its real qualities. All these problems derived from materialism.