The holy flame in front of the statue lit by Saicho is known as the Eternal Light as has burned continuously for 1200 years without even once being extinguished.
その宝前に灯明をかかげて以来最澄のともした灯火は1200年間一度も消えることなく輝き続けているので、不滅の法灯と呼ばれる。