The teaching uses the metaphor of a doctor checking a person's physical vital signs to emphasize the importance of monitoring spiritual "vital signs" to assess the health of a church or individual believer. 

Spiritual Sensitivity: Revival restores sensitivity to sin and against prayerlessness.
Form vs. Substance: It is possible for a church to have the form of religion without the true presence of Jesus (Revelation 3:20).

Self-Preservation vs. Revival: A church overly conscious of self-preservation will not experience a true revival.
Deception: The devil is a master of deception, and even religious activities can be controlled by the enemy if they are designed to satisfy personal appetites rather than God's will.

Focus on Christ: While God is a healer, personal needs cannot be the main focus; putting Christ first is paramount for sustained revival and kingdom purpose