“Conscience in men is nothing else but the voice of the omnipresent God moving in the heart–the Lord knows all …. Watch your heart throughout your life; examine it, listen to it, and see what prevents it from uniting itself with the Lord. Let this be your supreme and constant study …. Examine yourself more often; see where the eyes of your heart are looking.”
(St John of  Kronstadt, ‘My Life in Christ’)