You can think you know all the world's knowledge, but thinking you are then smarter than everyone else would be a serious error on your part. For there may always be a fact you overlooked, that someone else might know. There is always something more to learn from life!
And of course, counterarguments are always called fake news by the other party, so if everything is called fake, can we rely on any of it? Fortunately yes, there is such a thing as discernment, gut feelings, or intuition. Sometimes this turns into knowing: the certain feeling you know something, but you have no idea why or how you know.
