Cryptogram from Frankenstein; or, the modern prometheus, chapter 18

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I remembered also the necessity imposed upon me of either journeying to England or entering into a long correspondence with those philosophers of that country whose knowledge and discoveries were of indispensable use to me in my present undertaking. The latter method of obtaining the desired intelligence was dilatory and unsatisfactory; besides, I had an insurmountable aversion to the idea of engaging myself in my loathsome task in my father's house while in habits of familiar intercourse with those I loved. I knew that a thousand fearful accidents might occur, the slightest of which would disclose a tale to thrill all connected with me with horror. I was aware also that I should often lose all self-command, all capacity of hiding the harrowing sensations that would possess me during the progress of my unearthly occupation. I must absent myself from all I loved while thus employed. Once commenced, it would quickly be achieved, and I might be restored to my family in peace and happiness. My promise fulfilled, the monster would depart for ever. Or (so my fond fancy imaged) some accident might meanwhile occur to destroy him and put an end to my slavery for ever.