鐵杵磨成繡花針
Elbow-grease is the best polish
Proverb
(以上圖片引用自: http://izquotes.com/quote/314668)
另外也有這樣的說法:
Elbow grease gives the best polish.
李白的故事:
https://tw.answers.yahoo.com/question/index?qid=20080317000010KK09510
也引述為”天下無難事, 只怕有心人”, 或是”有志者事竟成”.