"Doubt thou the stars are fire, Doubt that the sun doth move, Doubt truth to be a liar, But never doubt I love." is from which play by Shakespeare?

"Doubt thou the stars are fire, Doubt that the sun doth move, Doubt truth to be a liar, But never doubt I love." are line from the play "Hamlet" by William Shakespeare. These lines are spoken in Act II, Scene II by Polonius while he is reading a letter to Gertrude. It is Hamlet’s letter to Ophelia.

In this instance, Hamlet in his letter is trying very hard to impress Ophelia. He is pointing to the true depth of his love for her. He is saying that she can doubt some eternal truths; but, she cannot for a moment doubt his great love for her.

Ophelia must not doubt that he loves her. As a tormented person, he is using the strongest terms he can to summon up his feelings for her. Even if she questions things that are generally taken to be true, (some of the most powerful forces in the universe, that the stars are made of fire, and that the sun moves, and that there is even such a thing as truth), she should never doubt his unending love for her.