And when he heard that it was Jesus of Nazareth, he began to cry out and say, “Jesus, Son of David, have mercy on me!” Mark 10:47 . “Constantly call: “Lord, Jesus Christ, Son of God, have mercy upon me!” in order that this remembrance of the Name of our Lord Jesus should incite you to battle with the enemy. By this remembrance, a soul forcing itself to do this practice can discover everything which is within, both good and bad. First, it will see within, in the heart, what is bad, and later — what is good. This remembrance is for rousing the serpent, and the remembrance is for subduing it. This remembrance can reveal the sin living in us, and this remembrance can destroy it. This remembrance can arouse all the enemy hosts in the heart, and little by little this remembrance can conquer and uproot them.” St John Chrysostom