Only the true Master reveals the path leading to the ultimate goal, because only one who is himself free can make us free. Only he whose heart is illuminated by Divine Light can ignite the light within our hearts. During the Diwali festival, you light candles in your houses using a candle which you have already lit. Only a lit candle has the potential to light another candle and thus eradicate darkness. The darkness of our mind is due to anger, attachment, temptation and vanity and can be eradicated by the one who is himself enlightened with the Divine Light.