Understanding and experience.

Understanding of something is at the level of voice. So when you disqualify the understanding you will get that nagging voice. This is the experience.

Understanding can be dangerous becuase it needs protection. Then right and wrong is based on that understanding.

Understanding based on the explanation of others could be wrong. But if you believe in it you have to deal with it on the level of mind.

Your understanding must be based on your truth. Or by careful observation, otherwise it will create noise.

It will be much slower and most effective way.

You would get chance to clean conflicting understanding and you have to take that chance.

Than there is experience. Or the direct precption based knowledge This is unchallengeable.