Emam Ali

He who is greedy is disgraced; he who discloses his hardship will always be humiliated; he who has no control over his tongue will often have to face discomfort

. The mind of a wise man is the safest custody of secrets; cheerfulness is the key to friendship; patience and forbearance will conceal many defects. .

I found a website in English that is really great for those who want to read about Emam Ali:

http://www.balaghah.net/nahj-htm/eng/index.htm

آنکس که بداند و بداند که بداند

اسب خرد از گنبد گردون بجهاند

آنکس که بداند و نداند که بداند

بیدارش نمایید که بس خفته نماند

آنکس نداند و بداند که نداند

لنگان خرک خویش به منزل برساند

آنکس که نداند و نداند که نداند

در جهل مرکب ابدالدهر بماند