There are some secrets which ...

There are some secrets which do not permit themselves to be told. Men die nightly in their beds, wringing the hands of ghostly confessors, and looking them piteously in the eyes - die with despair of heart and convulsion of throat, on account of the hideousness of mysteries which will not suffer themselves to be revealed. Now and then, alas, the conscience of man takes up a burden so heavy in horror that it can be thrown down only into the grave. And thus the essence of all crime is undivulged.
There are some secrets which do not permit themselves to be told. Men die nightly in their beds, wringing the hands of ghostly confessors, and looking them piteously in the eyes - die with despair of heart and convulsion of throat, on account of the hideousness of mysteries which will not suffer themselves to be revealed. Now and then, alas, the conscience of man takes up a burden so heavy in horror that it can be thrown down only into the grave. And thus the essence of all crime is undivulged.
 Edgar Allan Poe

Quotes from the same author

Those who dream by day are cognizant of many things which escape those who dream only by night.
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 Edgar Allan Poe
In the Heaven's above, the angels, whispering to one another, can find, among their burning terms of love, none so devotional as that of 'Mother.
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 Edgar Allan Poe
I must perish in this deplorable folly. Thus, thus, and not otherwise, shall I be lost. I dread the events of the future, not in themselves, but in their results. I shudder at the thought of any, even the most trivial, incident, which may operate upon this intolerable agitation of soul. I have, indeed, no abhorrence of danger, except in its absolute effect-in terror. In this unnerved-in this pitiable condition-I feel that the period will sooner or later arrive when I must abandon life and reason together, in some struggle with the grim phantasm, FEAR.
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 Edgar Allan Poe
In the marginalia ... we talk only to ourselves; we therefore talk freshly - boldly - originally - with abandonment - without conceit.
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 Edgar Allan Poe
It is the curse of a certain order of mind, that it can never rest satisfied with the consciousness of its ability to do a thing.Still less is it content with doing it. It must both know and show how it was done.
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 Edgar Allan Poe