Answer:
Humility
Step-by-step explanation:
Teresa of Avila was a Spanish nun who was part of the Carmelite order for the most part of her life. The early years of her life as a Carmelite she spent them defending the Carmelite practice of going without shoes not as a expression of sacrifice but as a expression of humility.
In general, the Carmelite sisters focus on the importance of practicing the value of humility and therefore, most of what they do is focused on them. Teresa of Avila was no exception and by going without shoes she was trying to express humility.