In other words, we believe there is a truth, even an absolute Truth with a capital T. But we are not so arrogant, nor so ignorant, to assume that we know this Truth with 100% certainty. This makes us humble and cautious, putting everything we think is true to the test. This way, we can come up with ideas that are, if not the Truth, at least a very good approximation of it.
Certain people, and I will not mention any names here, are arrogant, ignorant idiots. They not only think there is a Truth, but they are absolutely sure that they possess it. Because they do, they do not test their views against reality. And every time someone will point out to them that they are wrong, their arrogance comes in the way and they have to ignore that they are wrong. Then, they make up very idiotic ideas so they never have to confront reality. They say they worship all kinds of things, God, the bible, Jesus, Allah, but in fact the only thing they really worship is themselves. and their own idolatry.