Charles Finney emphasizes the critical role of conscience in determining our acceptance with God, explaining that a condemning heart indicates a deeper spiritual issue. He clarifies that conscience is not merely a feeling but a rational faculty that discerns right from wrong, and warns against the dangers of ignoring its voice. Finney stresses that if our conscience condemns us in any area, it reflects a broader disapproval from God, as true acceptance requires a clear conscience. He urges listeners to examine their hearts honestly, recognizing that a lack of peace with God often stems from unacknowledged sin. Ultimately, he calls for a deep introspection to ensure one's heart aligns with God's will, as self-deception can lead to spiritual peril.