Polonius echoes Laertes's words of warning about the dangers of Ophelia getting involved with Hamlet. When Polonius quizzes Ophelia about whether Hamlet has shown her signs of affection, she says he has made many tender and affectionate overtures to her recently. Polonius responds to that with worldly cynicism, saying,
Affection! Pooh, you speak like a green girl,
Unsifted in such perilous circumstance.
Do you believe his “tenders,” as you call them?
Polonius says Ophelia is being naive and asks if she believes Hamlet. When Ophelia responds that she is not sure, Polonius warns her to be wary and steer clear of him. He reminds her that Hamlet is a powerful prince, someone who is used to getting what he wants. She is simply the daughter of a courtier, a man who does the bidding of kings and princes. She and Hamlet are not on the same level, and there is every likelihood he would love her and leave her. He may promise her "holy vows of heaven," as she calls his words, but she must not trust him. Polonius states, with amazing brevity for him,
In few, Ophelia,
Do not believe his vows