What is the difference between Mojtahid and Marja’a? The Grand Ayatollah Seyyed Sadeq Rouhani’s answer

The Grand Ayatollah Seyyed Sadeq Rouhani answered a question about the difference between Mojtahid and Marja’a.

Question: What is the difference between Mojtahid and Marja’a?

The Grand Ayatollah Rouhani: Marja’a must be A’alam (highest ranking scholar of Islam) and being Mojtahid is not enough to be a Marja’a.