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regards the hair, nails &c being the cause of mental knowledge it would suffice to say that since they never appear affected by mental thoughts they can never be the said cause. If the mental knowledge is bound by the hair, nails &c it is capable of being totally destroyed by their removal. If the hair, nails &c. are hurt, the mental knowledge should also receive a corresponding hurt but this is not the case ; therefore this third argument also falls to the ground.
Moreover subtility of sense, logical distinctions and acuteness of memory are features of mental knowledge but these are cultivated by constant practice. The same books when studied frequently and closely show deeper and deeper meanings and the acuteness of memory is also cultivated. In this manner when one book is studied and its meaning thoroughly grasped and the memory sharpened, it leads to an easy understanding of other books and the memory is developed. Such mental phenomena are often
