Why do we light candles for Shabbat?

Shabbat is referred to as a "delight." We enhance the beauty of our Shabbat meal and make it more delightful by adorning it with candlelight. The candles are also a way of honouring the holiness of Shabbat. Another reason: When one lights one candle from another, the first candle is not diminished. So, too, a Jew draws enough spiritual strength from Shabbat to last the entire week, without detracting from the holiness of Shabbat.