Nothing wrong with quotes as long as

(A) you are sure the recipient will understand them the same way as you intend them. You can be sure that a quotation from Adam Smith or Karl Marx will be percieved differently by different listeners; that is true whatever the source. If I quote Shakepeare I can be thought erudite or a pretentious fool!
(B) following on from (a) it is best if you know the context of the quote. A lot of people who quote Marx 'opium of the people' haven't read the paragraphs before or after the famous phrase so have no idea if it really means what they think it does.
(C) understand that this is the logical fallacy known as "appeallinhg to authority". That's not to say it is necessarily untrue but it forms no part of logic.


We have drifted some distance from BA strikes and the capitalists involved. Apologies for that, but there is still a connection of sorts. There is merit if all sides present their arguments as they believe them, without relying on third parties. [Hmmm, sounds like I am in "pretentious fool" mode]