Like men, jinns have also good and bad elements among them. Almighty Allah has endowed them with such power that if they want they can, with the Will of Allah, harm human beings. This is the reason mischievous jinns harm people. Similarly, influence of the evil eye is also true. What it means is that if a person looks at someone with greed and envy, the evil effects of his look will reach the person viewed, and because of that he has to suffer some loss or trouble or accident. For this reason, the Prophet (PBUH) would seek the protection of Allah against the jinns and the evil eye and pray in his own words for it, saying: "I seek Your protection against jinns and evil eyes of the people." After the revelation of the Surah Al-Falaq and An-Nas (last two Surah of the Quran) he started reciting them because these were revealed for this purpose. These Surah are also called "Al-Mu`awwidhatain" which mean two Surah which provide protection. It is, therefore, very useful to seek the protection of Allah by reciting them.