Teresa of Avila was a Carmelite nun and author of an autobiography that is one of Spain’s most read books: The Life of Saint Teresa of Avila by Herself.
“In selecting candidates for this austere way of life, she insisted above all on intelligence and good judgement
(God preserve us from stupid nuns!)
because she believed that intelligent people see their faults and allow themselves to be guided,
while deficient and narrow-minded people fail to do so,
but are pleased with themselves and never learn to do right.”
Extract on Theresa of Avila (1515-82) taken from The Oxford Dictionary of Saints.