Anxiety and disturbance of mind, has always appeared as a calamity in the life of man. On the other hand, confidence and comfort has been a lost object of man, and to find it out, uncountable amount of work has been done without the necessary effect. Statistics have shown that when cholera has attacked a people six person out of ten have died by fear and anxiety, and only four people were the direct victims of cholera itself!

      In general, anxiety and fear plays a vital role in man's stage of safety and health, and also in fortunes and misfortunes. In this relation, Qurän, in a short verse shows how man may overcome the anxiety and disturbance of his heart; to reach a state of confidence and assurance:ِ

      ``Behold! By remembrance of Allah hearts can be assured.''

      Anxiety may have various causes like:ِ

1- Vague past. 2- Unknown and obscure future. 3- Weakness. against natural calanities. 4- feeling to be vain and useless. 5- Suspicion and fancies. 6- Worldliness and being too much engrossed and occupied in the oncerns of this world.

On the other hand, faith in God is always accompanied by self confidence, asceticism, and piety. In faith there is hope, and where there is hope there is life. The belief in the resurrection is also a means that removes the fear of death and going to nothingness. So if a believer, whole heartedly turns attention to God, and His power, wisdom and mercy, knowing His presence everywhere and in every time, willing to help his servant, what can disturb such a mind and make such a heart anxious?