There are three kinds of truth: additional truth, expanding truth, and replacement truth.
Additional truth is the easiest to perceive and receive. It is new information that does not affect anything you presently believe. Most things taught in most formal settings (school, church, etc.) are additional truth.
Expanding truth is information that is adjacent to what you presently believe. It may indirectly affect what you presently believe, because it will add complexity to your beliefs, and complex systems may change radically from the adjustment of their conditions. This type of information is rarely taught in church, because most churches teach truth as fixed and unchanging, but sometimes you will encounter it in advanced educational institutions.
Replacement truth replaces what you presently believe. It is nearly impossible to find this type of truth in a church (as it would imply that the lay member has learned more than the credentialed leaders), and it is very rare to find this in any educational setting (even in science research, where this is the alleged objective).
Replacement truth is the hardest to perceive and receive, yet is the most beneficial because it provides the most extensive movement toward higher truth. Humans are nearly universally resistant to replacement truth, and those that obtain it are almost certain to be labeled heretics by their peers, no matter the setting.
We tend to think that if we have a witness of a truth, or have seen positive fruits from it, there is no possibility that another perspective on the same issue could be more correct. Spiritual law, like natural law, is progressive. In science, a theory’s ability to explain past observations does not guarantee it can explain all future observations. This is just as much the case in spiritual matters. In fact, spiritual truths might be more likely to be superseded by higher truth, given that religions tend to deteriorate. For example, the Lord Jesus not only taught the Pharisees truths higher than the law of Moses, but he also corrected the incorrect traditions erroneously taught as part of the law of Moses. The Pharisees refused to receive higher truth, and as a result ended up more wicked than if they had never met Jesus. God can reveal truth, and he can reveal higher truth.