These things cannot forego the existence of the doubt.
"For even if a man," says Victor Cousin, "doubt everything else, at least he cannot doubt that he doubts." The doubt had at times been on me that my Lady of the Shroud was a Vampire.

Much that had happened seemed to point that way, and here, on the very threshold of the Unknown, when, through the door which I was pushing open, my eyes met only an expanse of absolute blackness, all doubts which had ever been seemed to surround me in a legion.

I have heard that, when a man is drowning, there comes a time when his whole life passes in review during the space of time which cannot be computed as even a part of a second.

So it was to me in the moment of my body passing into the church.

In that moment came to my mind all that had been, which bore on the knowledge of my Lady; and the general tendency was to prove or convince that she was indeed a Vampire.
Much that had happened, or become known to me, seemed to justify the resolving of doubt into belief.