Colin Gunton mentions in passing that:
Evangelicalism arises out of: (a) the Reformation and (b) Pietism.
I've heard that before but cannot remember where. The question is do we know our own history? How far are we aware of where we have come from.
I would say we are doing better at remembering one of our parents (the Reformation) and less good at remembering the other. I would even go so far as to say that Evangelicalism may be suffering for it.... but that may just be from my limited view in the corner I inhabit. But there is room for us to remember all our history much more than we do.
Once we remember we may then attempt to reflect.
Colin Gunton comments that to the extent Evangelicalism relies on the Reformation it is more objective, and on Pietism more subjective. PT Forsyth comments:
'after the Reformation period, [theologians] dwelt upon justification until they lost sight of sanctification altogether. Then the great pietistic movement had to arise in order to redress the balance.' (The Work of Christ)
...I wonder whether I should read Pia Desideria... its only 136 pages apparently.