Fr.John swung into action and brought hundreds of people to the Christian fold. He could witness joyfully both the high caste people and the dalits (low caste) participate together in the Liturgical functions. In December 1677, there were torrential rains and on 17th, the river swelled. Floodwaters entered the Church campus and Fr.John and some of his neophytes had to swim for their life. They took shelter in an old fort. The floods receded after three days. But the Church and the Priest's house with all the furniture and the holy objects were washed away by the floods .The Princes of Udaiyarpalayam made a kind gesture of rebuilding the Church. The New Year was celebrated in the new Church.
Thereafter, he was asked by his Provincial to establish a new mission-center in Koovathur, formerly called Kuttur. He built a Church and a house in 1678. Though he was residing at Koovathur, he used to go to Thatthuvancherry on important days to give spiritual assistance to the Christians. His field of activity extended to 130 kms from North to South and to 50 km from East to West. He was travelling always on foot to visit the sick, administering the Sacraments to the neophytes and to preach the good news to others.
Arulanandar came thrice to Kumbakonam town to visit the Christians. When he came first in 1679, the town was gripped with epidemic. He spared no pains to serve the sick without even having basic amenities. As a result blisters appeared in his legs and he left to Thatthuvancherry.
In 1683, he came again to the town to visit the sick and administer them the last Sacraments. During these two visits, he could only comfort the poor children in their sufferings and confirm them in their faith.