Throughout the next 50 years, he remained active as a Christian teacher and writer.
Numerous students graduated and went on to become pastors, missionaries and Christian teachers.
Calasanz created an ideal image of a Christian teacher and used it to train the teachers who worked with him.
"We can't find Christian teachers, so there are Muslim teachers," he said.
Her aim was to produce not just good teachers but good Christian teachers, with a concern for their country and its future.
He probably traveled widely and ultimately settled in Rome as a Christian teacher.
It's good to see Christian teachers using whatever opportunity they have to share about God.
A private school comes under fire for hiring only Christian teachers.
The school only employs Christian teachers while more than 90 percent of the students are from Hindu backgrounds.
Perhaps even the words of Christian teachers who came even before Constantine ruled.