Our Matriachs, Sarah and Rivkah, brought a special blessings to their homes: their Shabbos candles lit from Friday to Friday. When it was time for Shabbos, they lit new candles which brought new light to their homes and the rest of the world. Interestingly, their miraculous Shabbos candles did not light indefinitely, but rather they needed to light new candles every week. This phenomena has a powerful lesson from each one of us.