There are many ways to assume that we know reality.
Taking the approach that we know allows for less insecurity.
However, as we’ll use assumptions, beliefs, prejudice, stereotypes, and other types of generalizations to fill the gaps in our map of reality, there is a high chance that we’ll be surprised by events and reactions.
Another approach is to remember that we have the habit to fill gaps and do that for a good reason. From there it is easier to verify if the gaps are still well-filled or if there is more to it that we can discover.
The difference between both approaches is what we believe to be the right thing to do.
Is it having a map that is accurate or is it revising the map as we go?
The first approach is based on the desire to be able to have an answer to every question one is asked. The second approach is being curious if others have the same answer.