Vesta enters Virgo on July 17th. Her extreme focus becomes even more extreme in the sign of details and perfection. Concentration is cranked up until the strings hum with tension.
This transit is about devotion to making it better. "It" will vary, according to the Virgo house(s) in your chart. There may be a specific detail that you become obsessed with. Or, a health issue will demand your attention. The acts of service and mundane work become religious, each small action part of a ritual. Vesta in Virgo is about finding the sacred in daily life.
This can be a time to explore the deeper connotations of virginity. Virgo the Virgin meets the goddess whose Vestal Virgins tended her temple flame. "Virgin" originally referred to a woman whose sexuality did not belong to any man (she was unmarried). Taking that a step further, chastity can be about keeping that energy for yourself, because you want to focus it elsewhere. You're in control, and you decide what you to do with your body, your temple.
The benefits of this transit include absolute purification - fervent deep cleaning on a physical/material level. Also, concentration can be enhanced to ungodly levels. You see the details that no one else sees, and you correct and polish ruthlessly.
The downside is probably obvious - crazy fixations on diet, exercise, criticism. It's not good enough/never good enough, and you can't see beyond the "flaw" because Vesta has blinded you to the bigger picture. Chastity is distorted into guilt, fear and repression. Sex becomes impure.
Healthy Vesta in Virgo is like exfoliation that reveals glowing skin. Distorted Vesta in Virgo continues to exfoliate until you bleed.
In general, this transit will call your attention to something that can be improved and refined. Make sure you focus on the improvement, not just the flaw.
Vesta will exit Virgo on September 18th, 2017.