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”.