Francis Petrarch? Plutarch? Henry Theodore Tuckerman? Frederick Saunders? Apocryphal?

Question for Quote Investigator: The following ornate passage about love has been attributed to Francis Petrarch, a prominent poet of the Italian Renaissance:
Love is the crowning grace of humanity, the holiest right of the soul, the golden link which binds us to duty and truth.
I am skeptical because I have never seen a solid citation. Would you please explore the provenance of these words?
Reply from Quote Investigator: The earliest match found by QI appeared in 1845 within “The American Review: A Whig Journal of Politics, Literature, Art, and Science”. Essayist Henry Theodore Tuckerman published a piece about the sonnets composed by Francis Petrarch. In the following passage, Tuckerman was not presenting a direct quotation from Petrarch; instead, Tuckerman was delivering his own summary opinion:1
Love, Petrarch maintains, is the crowning grace of humanity, the holiest right of the soul, the golden link which binds us to duty and truth, the redeeming principle that chiefly reconciles the heart to life, and is prophetic of eternal good. It is a blessing or a bane, a weakness or a strength, a fearful or a glorious experience, according to the soul in which it is engendered. Let us endeavor to define its action and vindicate its worth, as set forth in the Sonnets of Petrarch.
QI believes Henry Theodore Tuckerman deserves credit for the quotation under examination although Tuckerman was attempting to depict the thoughts of Petrarch.
Below are additional selected citations in chronological order.
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