Portuguese Sonnet from Thailand?

I sent mintie a postcard with a panda on it, so she sent me this:

Hua hin beach, thailand
From mintie in Bangkok
18 june 2007

"If thou must love me, let it be for nought
Except for love's sake only..."
"But love me for love's sake, that evermore
Thou may'st love on through love's eternity."
XIV. Sonnets from the Portuguese,
Elizabeth Barrett Browning