For the source text click/tap here: Nedarim 38
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Rabbi Yochanan said: The Holy One, Blessed be He, rests His presence (prophecy) only on someone who is strong, rich, wise and humble.
These requirements are derived from Moshe.
Moshe was rich, as it is written: Carve yourself: the chips from the carving will be yours. Moshe was wise, for Rav and Shmuel both said: Fifty gates of insight were created in the world, and all but one (the knowledge of God’s essence) were given to Moshe, for it is said: For you withheld him, by a little measure, from understanding God.
Moshe was humble, for it is written: Now the man Moshe was very humble. Rabbi Yochanan said: All the prophets were wealthy. This is derived from Moshe, Shmuel, Amos and Yonah. The Gemora proceeds to cite verses which demonstrate that all these prophets were wealthy.
Moshe (was wealthy), because it is written: I have not taken one donkey from them. Now, if he meant that he did not pay a fee - was he then merely excluding himself from those who take without paying a fee? Rather, he must therefore have meant (that he did not take any) - even with a fee.
We explore these qualities and the comparison between Maimonides with the RAN on prophecy.