What you understand today may eventually become the thing you need to reconsider.

Whatever you understand now is your best current account, not a final one. Some of it will turn out to be wrong, and the parts you are most confident about are as likely as any to be on that list. Holding present understanding as provisional is not weakness; it is an accurate description of how knowledge behaves.

Hold your views firmly enough to act on and loosely enough to revise. When something you were sure about turns out to be wrong, notice that this is normal rather than alarming. The alternative is not being right forever. It is being wrong without ever finding out.