初しょ志し貫かん徹てつ

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Meanings

1

carrying out one's original intention; seeing one's initial resolve through to the end

yojijukugo (four-character idiom)

A yojijukugo expressing the idea of sticking to and achieving the goal or determination one had at the start, without giving up.

初しょ志し貫かん徹てつをモットーに、彼かれは難なん関かんの資し格かく試し験けんに合ごう格かくした。
With 'carrying out his original intention' as his motto, he passed the difficult certification exam.
どんなに困こん難なんでも、初しょ志し貫かん徹てつの精せい神しんで最さい後ごまでやり抜ぬくつもりだ。
No matter how hard it gets, I intend to see it through to the end with the spirit of sticking to my original resolve.