The case of a human being is similar to that of steel. God has created ore, or naturally occurring iron. This iron ore is transformed into steel. Many other elements are added to it so that machines can be made. A human being is in the form of ore. He has to fashion himself in the state of a machine. Potentially, a person has all the elements within him. God has placed everything potentially inside a human being. This potential has to be converted into actual. This is the purpose of a human being in this world. 
The prerequisite for achieving this purpose is that one must be extremely alert and must think a lot. The more a person thinks, the more he will be able to fulfil his life's purpose. This is why, God has given us a mind that is full of capabilities. The mind is highly capable of thinking and analyzing. This is why it has been bestowed. Ore in itself has no quality. It is the engineer who moulds it and fashions it into a machine. A human being has been given a mind so that he can mould himself. The potential within has to be converted into actual. This is a human being's own work. No other person will perform this task on someone's behalf.