I can rely on your judgment." I thanked her.

I was glad not to be obliged to promise secrecy.

It might become my imperative duty to disregard such a promise.
"You have seen both of their faces ?" she asked.
I nodded.
"Then you must have observed the difference between them.

There is the same difference in their minds, though both are clouded.

One is weak almost to the point of idiocy, though strong enough where her one settled idea is concerned.