"Do not share the knowledge with which you have been blessed with everyone in general, as you do with some people in particular; and know that there are some men in whom Allah, may He he glorified, has placed hidden secrets, which they are forbidden to reveal. Remember the reply of the righteous slave to Moses when he said to him: 'May I follow you so that you can teach me what you know about what is right?' He replied: 'Surely you will not be able to be patient with me. How can you be patient about something which you do not understand?'" -
  --  Ali ibn abi talib