Earlier quoted context omitted.
Considering that da Vinci very likely never said that, your invocation of his authority is ironic. http://www.google.com/search?tbo=p&tbm=bks&q=argumen... http://en.wikiquote.org/wiki/Talk:Leonardo_da_Vinci Edit: I retract that last bit. Quoting someone isn't necessarily arguing from their authority. But it almost certainly isn't Leonardo.
I could care less who said what. I have thousands of quotes. The quotes help me learn whose books I should read. I copied and pasted that quote because I had it. The words are more important than where they came from. I don't have much respect for authority in the first place. I would just rather spend more time debating actual arguments than arguing about credentials. RE: Leonardo - Well until we find out who said i…
Really? Let me ask you a few questions, then. When was the American Revolution? What are the electrically charged parts of an atom? How does central banking work? How do red blood cells bind to oxygen?
If you will only accept as fact information that you have personally verified, you will know a very small collection of facts. The sensible thing to do in many cases is to appeal to authority: the collective opinion of experts in a field.
Heck, even in one's own area of specialty, one can't know everything. I can't personally evaluate every possible programming language or database in the world before choosing something; I take a clue from common opinion and narrow my search from there.
Really, this is one of the things that makes civilization possible.