ㄧㄡˇˇㄧㄡˇㄓㄨㄥyǒushǐ‑yǒuzhōng

有始有终
  1. 行事)​有頭有尾貫徹到底 做事有始有終不可輕言放棄」。

where there's a start, there's a finish (idiom)​; to finish once one starts sth, to carry things through, I started, so I'll finish.
(expr. idiom.)​ du début à la fin