Was it possible to run away from our prison?
No, I could not admit and I must not admit it.

And gradually conjuring up in my memory everything I knew about our prison, I understood that K.must have hit upon an old plan, which I had long discarded, and that he would convince himself of its impracticability even as I convinced myself.

It is impossible to escape from our prison.
But, tormented by doubts, I measured my lonely cell for a long time, thinking of various plans that might relieve K.'s position and thus divert him from the idea of making his escape.

He must not run away from our prison under any circumstances.

Then I gave myself to peaceful and sound sleep, with which benevolent nature has rewarded those who have a clear conscience and a pure soul.
By the way, lest I forget, I shall mention the fact that I destroyed my "Diary of a Prisoner" that night.