Doubt thou that the stars are fire; Doubt thou that the sun doth move; Doubt truth to be a liar; But never doubt that I love. - William Shakespeare, Hamlet

William Shakespeare's sonnet 130. It picks on the other poets of his time, but Shakespeare is very truthful.

“No sooner met but they looked; no sooner looked but they loved; no sooner loved but they sighed; no sooner sighed but they asked one another the reason; no sooner knew the reason but they sought the remedy..." ― William Shakespeare

That’s by Henry van Dyke, an American author born in 1852. So to call it Shakespeare is off by almost 300 years and a continent.