carry something through to the end 有始有终

中国人常说：“做事要有始有终”。“有始有终”，汉语成语，字面意思是有开头也有收尾（have a beginning and an end），比喻做事能坚持到底。可以翻译为“carry something through to the end”或“ finish what has been started”。

例句：

我们无论做什么都要有始有终，不可半途而废。

In doing anything, we must go through it from start to finish and never drop it halfway.