That being said, I think the Abbey could have found a better way to phrase this from their website concerning the Vocations entry.
At least average intelligence. The priest must faithfully transmit Catholic doctrine to the faithful, and accurately diagnose their sins in the confessional. Hence he must have at least average intellectual ability to pass his seminary courses.
That's the attitude that almost washed out this poor student:
St. Jean-Baptiste Marie Vianney, pray for us and for this young seminarian!