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Twelfth Night,
Act 2, Scene 1, lines 12-15.

Note to Twelfth Night, 2.1.12-15, "But I perceive in you so excellent a / touch of modesty, that you will not extort from me / what I am willing to keep in; therefore it charges / me in manners the rather to express myself"

This sentence says that because Sebastian can see that Antonio has the good manners to not demand to know what Sebastian doesn't want to tell, Sebastian's own good manners demand that he tell Antonio what he would rather keep to himself, which represents a sudden reversal on Sebastian's part. From the beginning of the scene it's obvious that Antonio is concerned about Sebastian and would like to look after him, but Sebastian refuses his help. Antonio then asks him to at least say where he is going. Sebastian replies that he's just going to wander about, but then decides that he will "express" himself to Antonio. That is when we get the information that he believes his twin sister is drowned and that he is headed to Count Orsino's court.

Peter Herrick as Antonio, the pirate
Peter Herrick as Antonio