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What is this sentence trying to say?

"I am by no means indifferent to the manner in which whatever moral tendencies exist in the sentiments or characters it contains shall affect the reader; yet my chief concern in this respect has been limited to the avoiding the enervating effects of the novels of the present day and to the exhibition of the amiableness of domestic affection, and the excellence of universal virtue."
sentence from Frankenstein preface.

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