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The Hitmen who came to assassinate him end up being polished for the better by their target
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Yusei Matsui (暗殺教室 1 [Ansatsu Kyōshitsu 1])
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I have no idea what kind of weapon will be used in World War III. But World War IV will be fought with tentacles." - Koro Sensei
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Yusei Matsui (暗殺教室 1 [Ansatsu Kyōshitsu 1])
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School and status have nothing to do with it.
Whether a fish lives in a clear stream or a water ditch, so long as it continues swimming forward, it will grow up beautifully.
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Yusei Matsui (暗殺教室 3 [Ansatsu Kyōshitsu 3])
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The educational policy he considers the most important isn't "what river you live in" but "How You swim in the river you live in".
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Yusei Matsui (暗殺教室 18 [Ansatsu Kyōshitsu 18])
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In this class you need to take sometime to learn from your teacher's experience or you won't be able to win against me (your teacher)"
Ansatsu Kyoushitsu
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Yusei Matsui (暗殺教室 7 [Ansatsu Kyōshitsu 7])
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When I really think About it, there are two reasons why people become teachers. To show off their success and to show of their failures.
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Yusei Matsui (暗殺教室 14 [Ansatsu Kyōshitsu 14])
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The world will always be filled with injustice. If you have time to give up or hold a grudge against that injustice, then use that time to enjoy battling those injustices instead
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Koro Sensei