Hypocrisy is wretched because the hypocrite says with his tongue what is not in his heart. He wrongs his tongue and oppresses his heart. But if the heart is sound, the condition of the tongue follows suit. We are commanded to be upright in speech, which is a gauge of the heart's state.
Hamza Yusuf, Purification of the Heart: Signs, Symptoms and Cures of the Spiritual Diseases of the Heart
self-awareness, spirituality