Charles Finney addresses the dangers of fanatical spirits during revivals, warning that some individuals may confuse genuine spiritual guidance with impulsive feelings. He emphasizes that true influence from the Holy Spirit enlightens the mind and leads to rational actions, rather than mere emotional impressions. Finney cautions that many who seem spiritually engaged can be misled by Satan, who disguises himself as an angel of light, leading them to act on misguided impulses. He encourages believers to discern between genuine compassion and mere impressions, advocating for a focus on love and prayer in their spiritual endeavors. Ultimately, Finney calls for a careful examination of one's motivations and actions during revival seasons.