I agree fully with this quote, there are always two ways of doing things, whether it is math or war. Some people may not agree, but they must have just never put their mind to anything. Those people must be really stubborn or really just bleak. Some people do not notice that there are better ways or just other ways of going about their problems and decide that they want to only listen to themselves. Those people usually do not make it far in life just take Franz Reichelt for example. He refused to take anyone else’s criticism and ended up dying just because he was too stubborn.
One of the other side’s strongest arguments is “well two plus two always equals four”, and yes they are right but the quote was not there are always two answers.