In few, Ophelia,
Do not believe his vows; they are brokers,
Not of that dye which their investments show.

– William Shakespeare

Hamlet, Act 1, Scene 3. Polonius, echoing the advice of his son Laertes, discourages Ophelia from taking Hamlet’s professions of love seriously because you cannot trust anything Hamlet says or promises. Like the obedient daughter that she is, she tells her father she will obey his order not to see Hamlet.