 [a] Metaphysics should be written with accurate definitions and demonstrations, [b] but nothing should be demonstrated in it that conflicts too much with received opinions. For thus this metaphysics will be able to be received. [c] If it is once approved, then afterwards, if any examine it more profoundly, they will draw the necessary consequences themselves. [d] Besides this, one can, as a separate undertaking, show these people later the way of reasoning about these things. [e] In this metaphysics, it will be useful for there to be added here and there the authoritative utterances of great men, who have reasoned in a similar way; especially when these utterances contain something that seems to have some possible relevance to the illustration of a view. (A VI.iii.573)