Traditionally, why were mirrors not available in Monasteries?

Was it possible that vanity was a fault among some religious?

How do you cope with the temptation to vanity?

Jesuit Father Jean Pierre de Caussade addressed this issue with a Visitation Nun centuries ago and had some good advice that even applies today.

He said to her:

Father de Caussade then quotes our Founder St Francis de Sales, with this precious statement: “One cannot put on perfection as one puts on a dress.”

He gives further hope by saying: