pen is mightier than sword because sword is used in wars to defeat someone.than the sword pen is very useful to achieve and win so it is a famous slogan pen is mightier than sword.
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Pen is mitear than sword. If you see war is waste. Owing to wars enormous loss of humans, and loss of money. With wars we cannot achieve any thing except deaths. If you see pen it useful in wrting different novel , etc,. So those novel, books,etc, we can pass that information from our generation to future generations.