The "Smile Mask Syndrome" is called the 'hidden depression,' and shows the symptom that the face of the patient looks smiling but his heart is full of anger and despair. The patient with this syndrome cannot be aware of it because he looks active and brisk outwardly. In the same manner, some believers are not conscious of their sins because the sins are not outwardly revealed. But in the sight of God, you've already murdered someone if you hate him from the heart, and committed adultery with a woman if you look at her with lust for her in your heart (1 John 3:15; Matthew 5:28).