One thing he didn't want to do, was to reveal his knowledge to anyone else.

I had not consciously decided on revealing my knowledge of their language.

For that reason, he had no intention of ever revealing his knowledge.

I need not reveal my knowledge or its source to you!

And to do so without revealing his own extra knowledge of the terrain.

It was as if the ground itself spoke to her, revealing hidden knowledge of those who had passed.

She reveals her knowledge of the pregnancy to the club, and tells them that the whole school will soon know.

As expected, he soon reveals his knowledge of the mass death on Ellna.

Once there he confronts the con man and reveals his knowledge of David's past.

For example, a person could have been caught being deceitful by revealing their knowledge of information they were trying to hide.