Everything we claim to know, no matter how well we claim to know it, is capable of being proved wrong. Even the most steadfast, near-immutable laws of the world and universe could be overturned.
Mind you, I’m not saying that their overthrow is particularly likely. Actually, it’s quite improbable. But it’s still possible. There is an infinitesimal chance that we are utterly mistaken about the things we are most sure about it. So it follows that absolute certainty is an absolute myth. If there is a billionth of a percent of a chance that something is wrong then it is still not absolutely right.
This non-existence of absolute rightness has profound consequences, the chief of which is that it shakes the faith we have in our own understanding. If everything we know could turn out to be wrong, how can we lay claim to knowledge and certainty? We cannot, and that is the point. Human beings, for as long as they persist on this planet or another, are forever condemned to live amongst uncertainty and doubt. Whether we fool ourselves into thinking we’ve rooted it out matters not. Because the illusions we live under do not change the very fabric of reality. They do not change the fact that there is no such thing as complete certainty.