When your opinions start to coincide with those of the majority, it is time to reconsider your opinions.
Conventional wisdom
This appears to be the first time that this phrase has been used.
Popular opinion is the greatest lie in the world.
To know what everyone knows is to know nothing.
That which is common to the greatest number has the least care bestowed upon it
What is public opinion? It is private indolence.
Opinions are the cheapest commodities on earth. Everyone has a flock of opinions ready to be wished upon anyone who will accept them. If you are influenced by "opinions" when you reach DECISIONS, you will not succeed in any undertaking.
There's going to be a lot of people that don't like you, and there's nothing you can do about it. Instead of trying to win them over one by one, you need to do things that are getting huge swaths of votes [in the elections].
Common sense is not too common.
The good opinion of the vulgar is injurious.
Everybody says it, and what everybody says must be true.
Every man speaks of public opinion, and means by public opinion, public opinion minus his opinion.
what is popular need not necessarily be right or wise.
A universal feeling, whether well or ill-founded, cannot be safely disregarded.
Public opinion is the worst of all opinions.