So mayst thou live, dear! many years, In all the bliss that life endears,...

These lines read as a tender benediction—an affectionate wish that the addressed “dear” person will enjoy a long life filled with the kinds of happiness that make life lovable (“all the bliss that life endears”). The diction (“mayst,” “thou”) gives the sentiment a deliberately lyrical, old-fashioned tone, suggesting a poem that frames love or friendship in elevated, almost prayer-like language. Even without the full poem, the couplet functions as a conventional poetic toast: longevity, continued joy, and the preservation of whatever bond makes the speaker offer such a blessing.