The Importance of Knowing and Possession

Why is it important for people to be absolutely certain they are in possession of a final truth isn't simply knowing you exist enough? Why does the distinction matter anyway who cares about the difference between knowing and possessing certain truth. Only fallibleism always allows the possibility of infinite progress via continuous error correction admitting you can always be wrong even about fallibleism means that there is always more left to learn and understand when it comes to daycarts.