菩提本无树，明镜亦非台。本来无一物，何处惹尘埃。

Today , I have just read a book titled "孙悟空是个好员工". And I felt one of the story is quite meaningful and interesting. So I make a search in google and copy and paste the short story here to share with you.

五祖弘忍挑选继承人，一日聚集众僧，告取自本心般若之性，令其徒各作一偈，若悟大意，可付衣钵为第六代祖。时有上座僧神秀，学识渊博，思作一偈，写于廊壁间。偈曰：“身是菩提树，心如明镜台。时时勤佛试，勿使惹尘埃”。惠能闻诵后，问是何人章句，有人告之，惠能听后则说，“美则美矣，了则未了。”众徒听了笑其庸流浅智。惠能亦无怪意，说吾亦有一偈，于是夜间请人代书于神秀偈旁。偈曰：“菩提本无树，明镜亦非台。本来无一物，何处惹尘埃。”众见偈惊异，各相谓言，奇哉不可以貌看人。

There is a big different from "intentionally"(有) and "unintentionally" (无). Hope you can learn something from this story.