The lines revealed that Laertes was warning her sister to defend her chastity and this illustrates that the king was not trusted.
The line was "I shall the effect of this good lesson keep, as a watchman to my heart". The speech was gotten from Hamlet.
Laertes, who was Ophelia's brother was leaving for Denmark and returning to France. He earned his sister about the dangers that she could face with Hamlet. He told her to defend her chastity and her heart.
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