"I conjure you--however severe the conflict, gratitude shall ever be the predominant passion  of my soul--oh! fly this instant."
The Fair Orphan, a Comic Opera
At least 2 entries in the ESTC (1771).<br>
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See <u>The Fair Orphan, a Comic Opera, of Three Acts:  As performed at the Theatre in Lynn, by Mr. G. A. Stevens's Company of Comedians.</u> (Lynn: Printed by W. Whittingham, for W. Nicoll, in St. Paul's Church-Yard, and R. Baldwin, in Pater-Noster-Row, London, 1771). &lt;<a href="http://estc.bl.uk/T126017">Link to ESTC</a>&gt;