"鉄は使わないことで錆びる；水は停滞することでその純度を失う…同様に、不活動は心の活力を奪う。"
Simplified meaning
When metal isn't used, it starts to rust and turn bad. Water that doesn't move becomes dirty. Just like these things, when people don't use their minds, the mind becomes weak and less sharp. If you don’t think or learn new things, your brain can lose its strength and ability to function well.
Think about a bicycle. If you leave it outside and never ride it, the metal parts will start to rust and it might not work properly after a while. Similarly, if you keep your brain active by reading, learning, and doing puzzles, it stays healthy and strong. So, making sure to always use your mind, by engaging in different activities, keeps it in good shape.
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