noun
carrying out one's original intention; seeing one's initial resolve through to the end
A yojijukugo expressing the idea of sticking to and achieving the goal or determination one had at the start, without giving up.
初志貫徹をモットーに、彼は難関の資格試験に合格した。
With 'carrying out his original intention' as his motto, he passed the difficult certification exam.
No matter how hard it gets, I intend to see it through to the end with the spirit of sticking to my original resolve.