Surah 3. Aal-Imran, Ayah 102

 Meaning, always be conscious of Him; obedient and grateful to Him.

 lit., except as Muslims.

Fear is of many kinds: (1) the abject fear of the coward; (2) the fear of a child or an inexperienced person in the face of an unknown danger; (3) the fear of a reasonable man who wishes to avoid harm to himself or to people whom he wishes to protect; (4) the reverence which is akin to love, for it fears to do anything which is not pleasing to the object of love. The first is unworthy of man; the second is necessary for one immature; the third is a manly precaution against evil as long as it is unconquered; and the fourth is the seed-bed of righteousness. Those mature in faith cultivate the fourth: at earlier stages, the third or the second may be necessary; they are fear, but not the fear of Allah. The first is a feeling of which anyone should be ashamed.

Our whole being should be permeated with Islam: it is not a mere veneer or outward show.