“Knowledge is a three-level ladder. When people reach the first level, they feel arrogant; when they reach the second level, they become humble; when they reach the last level, they know that they know nothing.
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"Abderrahman Hassi Quotes." Quotes.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.quotes.net/quote/47564>.