Summary

The Old Yellow Book: Source of Robert Browning's The Ring and the Book

And would he not even have had his wife declared an adulteress for the sake of gaining the dowry? If then he has, as one may say, demanded the price of his honour in the Courts, how can he be permitted to commit such awful murders for honour's sake?
For whenever a husband is permitted by reason of natural law, or even by the civil law, to kill his wife for honour's sake, this power and faculty ceases whenever the husband has renounced it by imploring, as above, the arm of the law. And these complaints that he made, and his recourse to the Pope, show the price he put upon his honour.
Source: Gutenberg

The Old Yellow Book: Source of Robert Browning's The Ring and the Book

And even if without reason we were obliged to acknowledge that they were written by her, would it not be too bitter and too unreasonable an inference that from them arose the husband's motive for killing her because she had written them? No one of sound mind will be persuaded to pity the husband who has gone on to kill his wife for the sole reason that she had written love-letters. For conjugal honour is offended neither by note, nor by pen, but only by acts of impure dishonour; and of this, in our case, every shadow of proof is lacking.
Source: Gutenberg

The Old Yellow Book: Source of Robert Browning's The Ring and the Book

For whenever a wife is convicted of adultery, or is a manifest adulteress, she is always said to be "taken in crime." [Citations.]
And in very truth the reasons adduced by those holding the contrary opinion are entirely too weak. For murder committed for honour's sake is always said to be done immediately, whensoever it may be committed. Because injury to the honour always remains fixed before one's eyes, and by goading one with busy and incessant stings it urges and impels him to its reparation.
Source: Gutenberg

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