KATHERINE: He made her melancholy, sad, and heavy,
And so she died. Had she been light like you,
Of such a merry, nimble, stirring spirit,
She might ha’ been a grandam ere she died.
And so may you, for a light heart lives long.

William Shakespeare (1564-1616) English dramatist and poet

Love’s Labour’s Lost, Act 5, sc. 2, l. 15ff (5.2.15-19) (c. 1595)
    (Source)

To Rosaline.