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Furinkazan
風林火山

This expression signifies four mental attitudes toward battle that help one behave according to situations and timing: act quickly like the wind and quietly like a forest, invade vigorously like fire and be steadfast like a mountain. It became famous after it was utilized for the banner of Takeda Shingen, a military commander in the Warring States period. (風)＝Wind　(林)＝Forest　(火)＝Fire　(山)＝Mountain.
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Kiembanjo
気炎万丈

To be energetic and vigorous.
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Shitsujitsugoken
質実剛健

To be simple, serious and strong both physically and mentally.
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Ichiisenshin
一意専心

To concentrate intently on only one thing.
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Isshinshojin
一心精進

To devote one’s heart to only one thing.
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Tetchogotan
鉄腸剛胆

To have undaunted will like iron.
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Shichitenhakki
七転八起

To pick yourself up and continue working despite repeated failures.
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Ungaisoten
雲外蒼天

Goodness comes after overcoming difficulties with effort.
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Gashinshotan
臥薪嘗胆

To endure all kinds of difficulties in order to accomplish a purpose.
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Kenninfubatsu
堅忍不抜

To have a strong will and endure difficulties without being influenced by others.
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Yugenjikko
有言実行

To be responsible for fulfilling what you have said.
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Fugenjikko
不言実行

Logically carrying out what must be done without complaining.
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Shinkensekisen
心堅石穿

One can overcome any difficulties if one’s will is strong enough. (This expression signifies that it is possible to make a hole in even a stone with a strong will.)
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Shoshikantetsu
初志貫徹

To be consistent in carrying out one’s primary aim until it is accomplished.
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Seishinitto
精神一到

Everything is possible when we concentrate and devote effort.
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Onkochishin
温故知新

To discover new ideas and knowledge by examining what happened in the past.
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Ikkokusenkin
一刻千金

Even a little time is precious, like a thousand pieces of gold.
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Issunnokoin
一寸光陰

A lesson not to waste even a very small amount of time.
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Gokikadan
剛毅果断

To have a strong will, be vigorous, and bear any circumstance. To behave dynamically and boldly. (剛毅)＝ to have strong will, be dynamic, and bear any circumstances (果断)＝ to dare to act .
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Shintomekkyaku
心頭滅却

To erase the idle thoughts in one’s mind.