What happened in 1737 at jonathan edwards church to spark a revival?

The young people of Northampton experimented an explosion of religious enthusiasm. Many men and young women in New England could not get married because the population in rapids growth of the New England left little available earth, what hindered that the young people could sustain for if same. Of an age to get married, but tightened under their parents' authority, the men and the women in their last years of adolescence and twenty years they often devote him to the idleness, gossips and sexual sins. Edwards attached those sins in his preaching and, after years of resistance, many gods young people suddenly united him to the affiliation of the church, professing the conversion. Edwards wrote on this revival in his Faithful Narrative of the Surprising Work of God (1737)

the enslaved people onboard suffered from illness with some frequency

i really really really really really really dont know