I am become a perfect convert to matrimony, not from temporizing, but from YOUR arguments; nor, much as I wish to emulate your virtues and liken myself to you, do I regret the prejudices of anti-matrimonialism from your example or assertion.

No.
The ONE argument, which you have urged so often with so much energy; the sacrifice made by the woman, so disproportioned to any which the man can give--this alone may exculpate me, were it a fault, from uninquiring submission to your superior intellect." Whether Shelley from his own peculiar point of view was morally justified in twice marrying, is a question of casuistry which has often haunted me.

The reasons he alleged in extenuation of his conduct with regard to Harriet prove the goodness of his heart, his openness to argument, and the delicacy of his unselfishness.

But they do not square with his expressed code of conduct; nor is it easy to understand how, having found it needful to submit to custom, for his partner's sake, he should have gone on denouncing an institution which he recognized in his own practice.

The conclusion seems to be that, though he despised accepted usage, and would fain have fashioned the world afresh to suit his heart's desire, the instincts of a loyal gentleman and his practical good sense were stronger than his theories.
A letter from Shelley's cousin, Mr.C.H.Grove, gives the details of Harriet's elopement.