This book has been prepared in accordance with a wish expressed by many known and unknown admirers of my husband's writings, who desire to possess in a portable form the passages that have specially appealed to them in his different works, and in the _Life and Letters_. I have taken this opportunity of adding extracts from private letters, and from the writings he left unfinished, which would not otherwise have become known to any but his own family or a few intimate friends.…
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