Who said "I am but a man, subject to all human weaknesses"?

This quote is attributed to Karenin.

I am but a man, subject to all human weaknesses - Karenin

"I am but a man, subject to all human weaknesses"

Karenin

Character in Anna Karenina

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"What is this passion but the worst of all passions?"

"Nature has made us unequal, and it is futile to pretend otherwise"

"To be alive is to suffer"

"It is impossible to love a wife 'in the old way', if one has been deceived by her."