The secret of success is constancy of purpose.

　　成功之秘诀乃为目标之有恒。

　　【世博精解】

　　Secret - something kept hidden or known about by only a few people，秘密；机密。The secret of health养身秘诀；make no secret of something对某事毫不掩饰。

　　Constancy - the quality of staying the same even though other things change，坚定；坚贞；经久不变。Constancy of purpose目标坚定。

　　Purpose–the thing that an event, process, or activity is supposed to achieve, or the job that something is supposed to do，意图；目的。What is his purpose in coming?他来的意图是什么？

　　这个谚语告诉我们确立目标，持之以恒就能成功地将事情完成。