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That is certainly true. Some of the longest works that I have read are theological texts and finishing them gave me was an unbelievable amount of satisfaction.
Leaving a book in the middle just feels a little........................ like one more thing that you didn't finish. Although I can't preach that to vehemently since I have left my share of books unread...........just not recently.

I gotcha on the urge to complete books.

That is interesting if you have read long theological texts then you definitely must read 12 Rules for Life - it discusses several Bible passages in detail.