Vesta is devotion — the sacred flame kept burning, and the focus that comes from giving something your undivided attention. Her priestesses were sworn to the hearth, which makes Vesta both dedication and what dedication costs: what you set aside to keep the fire lit.
Transiting Vesta circles the chart in about 3.6 years — the fastest of the four. Where she lands, attention narrows: one thing gets the focus and the rest is temporarily set down, which is either concentration or self-denial depending on what was set down.
focus, dedication, sacred or solitary work, and the sacrifice that concentration asks for.
Transiting Vesta conjunct natal Saturn is a window for the long, unglamorous work that only gets done when nothing else is competing for the attention.