Deuteronomy 28: 56-57:
56 The tender and delicate woman among you, which would not adventure to set the sole of her foot upon the ground for delicateness and tenderness, her eye shall be evil toward the husband of her bosom, and toward her son, and toward her daughter,
57 and toward her young one that cometh out from between her feet, and toward her children which she shall bear: for she shall eat them for want of all things secretly in the siege and straitness, wherewith thine enemy shall distress thee in thy gates.
The lesson is clear. Beware women who say they are too delicate to run barefoot. Beware women who get pedicures all the time.
This ancient wisdom is directly in line with my experience here in New York City.
Update: My Biblical interpretation may be off, as one commenter points out, and may be more along the lines of "This is what happens when you disobey...even the tenderest become evil."
(Thanks to Ira for the pointer.)