Thanks @christinaa for the reply. I will take care of your advice and try to take the subject deeper. How ever we should understand that it's the potential difference (voltage difference) which is responsible to cause a shock for human. A high voltage source with small current capacity (let's say a mosquito repeller at our home ) can give us shock and a high voltage, high current source (consider electrical generator of home) also can shock us. But a low voltage source ( such as car battery), does not give shock to the mechanic (although battery's current capacity is quite high).
So we can understand from these examples that voltage difference between our body and the source, is the first significant factor which can create troubles.

Another good example is a 'electric shock prank device' used by police as can be seen in this video

The circuit inside this device a momentary high voltage to cause a shock. Although it contains pencil cells, which are very low capacity current sources.

Thanks again for your descriptive feedback. and I agree with you, we should engage in healthy discussions. Thanks a lot.