I think that Edwards' tone is repeated because it really never leaves. Edwards makes it clear that there are two overall impressions that Edwards holds in the sermon. The first is that God is angry. Edwards does not miss a moment to bring this out. This tone never really leaves the sermon. Human action and choice has created a condition where human sin is present, and quite evident. This has angered God, and Edwards' tone makes this very clear. Additionally, Edwards contains a note of foreboding. For Edwards, not only is God angry, but is ready to take action. In this, Edwards' tone is reflective of how God is ready punish those who sin. The ideas of "their foot will slide" as well as the unavoidable wrath of God are both evident in Edwards' tone. Edwards' attitude is that humans have done wrong to God and the actions of the divine will reflect this level of anger. In this, Edwards does not abandon his attiude towards his listeners as well as those who have offended the sensibilities of God. This does not leave the sermon, being repeated often and at different points.