Yes, we constantly interrupt our practice because we want to know something, or because we want to know if we are doing it right.
Or, we stop our practice because we think we already know.
If we wear doubt like an armor, we can no longer be interrupted by anything and no more questions will need to be answered.
If we feel like we know, we will no longer be open to new insights. Many people think they are enlightened or think that they are experts and because of this their practice will come to a halt and they will no longer be open to the teachings of others.
I have to add that saying to others that you know something is not the problem! Someone can claim to be enlightened and actually be enlightened. The thing is, you should never become an expert in your own eyes, because that would be ego talking.
Edit: to clarify what I meant by that last statement, you can be awake (consciously aware of what is going on) and say to someone that you are enlightened at the same time. You cannot be awake while telling yourself that you are enlightened and believing in this. As soon as you say this to yourself, in that instant you are not awareness, but thought. You have become identified with the thinking process.