I have listed the citation source link. Because interested in the poet umar khayyam. And I quote and distribute in steemit. Because in my opinion, poet umar khayyam has full meaning and become a lesson for us all. In my post I have included the source by using "Markdown". And I do not mean to do plagiarism. Because according Hive account@steemcleaners not tersedeksi source, then this post I delete. Which need to note that in the post it, I have put the source by using tags or markdown. For the future I do not mention the source by using the markdown.