Ali ibn Abi Talib

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 be glorified, has placed hidden secrets, which they are forbidden to reveal.

You have a good many little gifts and virtues, but there is no need of parading them, for conceit spoils the finest genius. There is not much danger that real talent or goodness will be overlooked long, and the great charm of all power is modesty.