“Why, on good and evil.”

“The good and evil of what? a horse, an ox?”

“No; of a man.”

“Do we know then what Man is? what his nature is? what is the idea we have of him? And are our ears practised in any degree on the subject? Nay, do you understand what Nature is? can you follow me in any degree when I say that I shall have to use demonstration? Do you understand what Demonstration is? what True or False is? � must I drive you to Philosophy? � Show me what good I am to do by discoursing with you. Rouse my desire to do so. The sight of the pasture it loves stirs in a sheep the desire to feed: show it a stone or a bit of bread and it remains unmoved. Thus we also have certain natural desires, aye, and one that