  Philonous begins his first argument by contending that sensible qualities such as heat are not distinct from pleasure or pain. Pleasure and pain, Philonous argues, are allowed by all to be merely in the mind; therefore the same must be true for the sensible qualities. The most serious difficulties with this argument are (1) whether we should grant the “no distinction” premise in the case of the particular sensory qualities invoked by Berkeley (why not suppose that I can distinguish between the heat and the pain?) and (2) if we do, whether we should generalize to all sensory qualities as Berkeley would have us do.