Buddha is quoted thus: "Don't believe everything you read". Abraham Lincoln also apparently warned people to not believe everything on the Internet. I don't know; Lincoln was the one quoted in that poster I saw on the Internet.
Logically speaking, how could we anyway believe everything we read? Just when you had permanently concluded that laughter is good for health, some researchers come out of their isolated offices and tell you that your organs might get ruptured or displaced if you laugh too much.
Just when you were sure that deep introspection is what might make you a better human being, some psychologists warn you about the side effects of deep thinking. Who wants to be a better human being but, at the same time, slightly insane? (Makes you wonder how they arrived at such a conclusion without thinking too much).
Not a single so-called Universal truth is left untouched or unchallenged. There are many ways to use rational thoughts to either construct or destroy the same case. People, meanwhile, simply choose what they want to believe and ignore everything else.
What next? We must simply wait for Mark Twain to tell us (via the Internet, of course) to start believing everything we read. That way, we'll take ourselves less seriously and life will be a lot more fun.