Hissar is an integral and indispensable part of an amal without which an amil may not be able to perform his amal successfully. This is because of the fact that a hissar protects the amil throughout his amal from negative forces and wards off dangers. It is like a protective barrier around the amil through which no evil force can enter to harm the amil to disrupt his amal. This may be an invisible protective barrier but it is strong enough to protect the amil from even the most powerful attack. What makes this barrier so strong is the fact that an amil creates this barrier with the help of the Quranic verses, the power of which are unparalleled.
An amil has to keep in mind that however strong he may be but he cannot match the strength of the moakils. The moakils start coming towards the amil when he starts his amal. Performing hissar before the amal assures that the amil will be totally safe from any sort of harm or attack, from supernatural forces.
The moakkils try to disrupt the amal by scaring the amil. Hence, the amil should learn to ignore any scary thought that enters his mind during the amal. Such thoughts are unreal and are meant to scare the amil so that he gives up and discontinues his amal. So they should be ignored completely to perform the amal successfully.
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