This remarkable book demonstrates that the Pietist revival on the continent of Europe in the 18th century was an important source of the Wesley brothers’ understanding of the order of salvation with its two-staged distinction between justifying faith and full sanctifying grace. This Pietist revival gave spiritual birth and theological understanding to Christian David who had decisive theological influence on John Wesley at Herrnhut in 1738. It was then that John Wesley learned to make a distinction between the saving experience of disciples before Pentecost when their sins were forgiven and after Pentecost when their hearts were cleansed from all sin, as a pattern for all Christian believers.