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*1 This contains an argument for Prophethood along with a proof of Tauhid and of Allah's Compassion and Providence. The argument is this:

There are many divergent ways of thought and action open for man to choose from. Obviously all these divergent ways cannot be straight ways, because there can be only one straight way; therefore, there can be only one right theory of life which is based on that way, and only one right way of life which is based on that right theory. Thus it is clear that the choice of the right way of life is man's most important and basic need, for its wrong choice would inevitably lead to his ruin. This is because all other things fulfill his animal needs only, but this is the greatest necessity of his life as a human being and without its fulfillment his life would be an utter failure.