Reformers on Regeneration

"In the early Protestant writings on conversion, there is reference to the three basic elements of faith, repentance, and the renewal of the will. Luther tended to identify conversion with faith, Calvin with repentance, and Melancthon with the renewal of the will."

(Encyclopedia of Religion in the South By Samuel S. Hill, Charles H. Lippy, Charles Reagan Wilson Published by Mercer University Press, 2005)

See here