The fear and love of God the pious, faithful people posses reflect themselves on their faces, and is felt and seen as excitement. Yet it is impossible to witness this in a person with a hollow soul, body, and mind. Because they are careless as they have severed their ties with God. And as they are careless, they have lost their sense of excitement.
Believers find excitement in the eagerness to carry out jihad, that is to say, struggling intellectually for the sake of Islam. If the hearts of people are plagued by laziness and carelessness, they grow weary and negligent. They withdraw into themselves as they do not concern themselves with religion, fear of God, or love of God. They do not feel any excitement that will reflect on their faces.
Our Prophet (pbuh) had a piercing gaze. Why? Because his heart was always with God. He feared God. But polytheists would stare vacantly. Because they would only care for the fullness of their stomachs. They were like animals, even lower than animals. Therefore, they would have animal-like gazes.
The fear and love of God prevents people from gazing purposelessly. There can be no explanation for the purposeless gazes of those who fear God. The gazes of those who fear God are definitely clever, piercing and watchful.