Once a Jew came to ALi (R.A) with a view to ridiculing Islam
The Jew was very rich, he mocked the Islamic way of simplicity. He tried to enter into an argument with Ali (R.A) and declared that if his questions were answered to his satisfaction he might become a Muslim
Ali (R.A) said that he would be glad to answer any questions put to him. The Jew said "Suppose you are standing at the roof of a multistoried building at a great height. Who will protect you?". Of course Allah will protect protect me" said Ali (R.A). The Jew thereupon said "Do you feel confident that Allah will really protect you?"
Ali (R.A) said "Certainly, it is our faith that as long as we are ordained to live Allah will protect us." The Jew observed: "if you are so confident of the protection of Allah, would you be prepared to climb a high building and the jump therefrom in order to see how Allah protects you?"
Ali (R.A) said that he was not a fool to jump from a hight building for nothing. The Jew said that he did not want him to undertake the exercise for nothing, because if Allah protected him, he (the jew) would become a Muslim.
Ali (R.A) said that suck stipulation was erroneous and foolish. "How was that so" enquired the Jew. Ali (R.A) said that it must be realised that Allah is Master and man is servant. It is open to the Master to put the servant to test, but does not behove a servant to put the Master to any test. If Allah put any test that means a lack of faith, and when faith is lost everything is lost. The Jew said "This means that you are afraid taht if you take a jump you will die and Allah will not protect you"
Ali (R.A) said "I am not afraid of death, but as a servant I cannot defy the Master. Everything in the universe is subject to the will of Allah. That will is the law, and man has been endowedwith reason to discern the law. If knowing the law I choose to defy it I will have to suffer for breaking the law. When i deliberatly break the law laid down by the Master i lose the right of the Masters protection. More over, Allah protects us as long as we are ordained to live. If i take a jump and die as a consequence it would not mean that Allah has withdrawn His protection. It would merely mean that i was ordained to die like that". There upon the Jew said. "Ali (R.A), you are right, hasten to convert me to Islam". And the Jew was duly converted to Islam, and for the rest of his life he remained a staunch Muslim.
As Muslims, we should have full Yakeen (Faith) that all occurances on the earth are only due to the command of Allah Ta'ala. We should also try to fully understand our deen so that we may not be tricked or confused by people trying to take us away from Islam.