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https://en.wikipedia.org/wiki/Christian_revival
"Revivalism is increased spiritual interest or renewal in the life of a church congregation or society, with a local, national or global effect. This should be distinguished from the use of the term "revival" to refer to an evangelistic meeting or series of meetings (see Revival meeting).
Revivals are seen as the restoration of the church itself to a vital and fervent relationship with God after a period of moral decline. Mass conversions of non-believers are viewed by church leaders as having positive moral effects."