translation.en: And have I not cause for such a feeling? Consider the long sequence of incidents which have all pointed to some sinister influence which is at work around us. There is the death of the last occupant of the Hall, fulfilling so exactly the conditions of the family legend, and there are the repeated reports from peasants of the appearance of a strange creature upon the moor. Twice I have with my own ears heard the sound which resembled the distant baying of a hound. It is incredible, impossible, that it should really be outside the ordinary laws of nature. A spectral hound which leaves material footmarks and fills the air with its howling is surely not to be thought of. Stapleton may fall in with such a superstition, and Mortimer also; but if I have one quality upon earth it is common-sense, and nothing will persuade me to believe in such a thing. To do so would be to descend to the level of these poor peasants, who are not content with a mere fiend dog but must needs describe him with hell-fire shooting from his mouth and eyes. Holmes would not listen to such fancies, and I am his agent. But facts are facts, and I have twice heard this crying upon the moor. Suppose that there were really some huge hound loose upon it; that would go far to explain everything. But where could such a hound lie concealed, where did it get its food, where did it come from, how was it that no one saw it by day? It must be confessed that the natural explanation offers almost as many difficulties as the other. And always, apart from the hound, there is the fact of the human agency in London, the man in the cab, and the letter which warned Sir Henry against the moor. This at least was real, but it might have been the work of a protecting friend as easily as of an enemy. Where is that friend or enemy now? Has he remained in London, or has he followed us down here? Could he--could he be the stranger whom I saw upon the tor?
translation.pl: Powodów do obawy nie braknie. Cały szereg okoliczności złożył się na wzbudzenie w nas przesądnego strachu: naprzód tajemnicza śmierć poprzedniego właściciela tej rezydencyi; dalej -- pogłoski, krążące po okolicy, wreszcie te zagadkowe odgłosy na bagnie. Słyszałem je dwa razy na własne uszy... Wszystko to wyłamuje się z pod zwykłego porządku rzeczy i praw natury: pies widmowy, legendowy, pozostawia ślady stóp i wyje przeraźliwie. Stapleton nawet wierzy w jego istnienie, a doktor Mortimer, pomimo swej wiedzy, przekonany jest, że widział jakieś nadprzyrodzone stworzenie. Ja, choć nie jestem uczonym, jak ci dwaj panowie, nie mogę jednak w to uwierzyć; byłoby to zejść do poziomu umysłowego włościan okolicznych, którzy gotowi przysiądz, że widzieli psa, ziejącego ogniem i siarką.