Every candle that is lit for a mitzvah is extremely holy. 

If we had ruach hakodesh, we would perceive the future when we light those candles, just like a navi giving over what he heard from Hashem’s mouth. 

~ Kav HaYashar (96)

The Arizal was able to gaze at the candles and perceive the future. When we look at the candles, we might not understand them, but they are speaking.