And in general it is because these thinkers suppose knowledge to be sensation, and this to be a physical alteration, that they say that what appears to our senses must be true; for it is for these reasons that both Empedocles and Democritus and, one may almost say, all the others have fallen victims to opinions of this sort. For Empedocles says that when men change their condition they change their knowledge; "
For wisdom increases in men according to what is before them. "
And elsewhere he says that:- "
So far as their nature changed, so far to them always
Came changed thoughts into mind. "
And Parmenides also expresses himself in the same way: "
For as at each time the much-bent limbs are composed,
So is the mind of men; for in each and all men
'Tis one thing thinks-the substance of their limbs:
Studies
