Narrated 'Abdullah bin Mas'ud:
The Prophet said: "Do not aim to be anyone (living in someone else's), except in two cases:
a person to whom God hath given riches, and she spends the justly, and those to whom God has given wisdom and he acts according to it (wisdom) and teaches to others. "
[Sahih Bukhari Volume 1, Book 3, Hadith 73]