He who knows not and knows not that he knows not, is a fool — shun him!
He who knows not and knows that he knows not, is unlearned — teach him!
He who knows and knows not that he knows, is asleep — awaken him!
He who knows and knows that he knows, is enlightened — follow him!
From Arab proverb quoted by Lady Isabel Burton (1831–1896) in
The Life of Captain Sir Richard F. Burton
有些人不懂裝懂, 剛愎自用, 認為自己都沒錯, 錯的都是別人, 要儘可能避開這種人;
有些人知道自己缺少什麼, 他所缺乏的就是學習, 就要給予教導;
有些人不知道其實自己懂很多, 此時就要提點他們, 增進其自信;
當一個人知己知彼, 真材實料, 就要跟隨這種人。