Why Light Two Shabbat Candles?

Question:

I’m wondering why we have a custom to light at least two Shabbatcandles. And why do some people light more than that? How do I know how many candles I should light?

Answer:

http://www.chabad.org/library/article_cdo/aid/3114280/jewish/Why-Light-Two-Shabbat-Candles.htm

Shabbat, a Palace in Time in these Challenging Times

http://m.jpost.com/Blogs/Double-vision/DOUBLE-VISION-Shabbat-a-Palace-in-Time-in-these-Challenging-Times-424921#article=6017RUY2NUY2MEYxNDY4NjBFNzgyMkRERUZBM0VBMzQ3MUE=