By innocence I swear, and by my youth,
I have one heart, one bosom and one truth,
And that no woman has, nor never none
Shall mistress be of it, save I alone.
– William Shakespeare
Twelfth Night, Act 3, Scene 1. Viola, dressed as Cesario and rejecting Olivia’s offer of love, tells Olivia that no other woman will be mistress of her heart. She fails to come clean and confess her true identity and the trickery she is engaged in by wearing the disguise of a man.