Jessie Penn-Lewis addresses the critical distinction between 'soul-force' and 'spirit-force', emphasizing the dangers posed by the misuse of soul powers in the current age of increased Satanic activity. She explains that the soul, which encompasses self-consciousness and moral faculties, can lead believers astray if it operates independently of the spirit, where God's presence dwells. The sermon warns that the world is witnessing a clash between the forces of the soul, manipulated by the enemy, and the divine forces of the Spirit, as humanity approaches the tribulation period foretold in Scripture. Penn-Lewis highlights the necessity for believers to understand their spiritual identity and the importance of relying on the Spirit rather than the fallen attributes of the soul. This understanding is crucial for resisting the deceptive tactics of the enemy in these last days.