for example: Thomas Edison, one of
the most prominent inventors in the 20th century, overcame 1500 failure and suitable filament for
electric light bulb which were affordable for all people to buy and use. He tried numerous
materials such as iron, copper, aluminum, silver, hair, even his colleague’s brown beard, but he
fails all times. Nevertheless he did not give up and dedicated himself in finding the best material.
The belief held by him was that “we will make the electricity so cheap that only the rich will burn
candles.” because of his confidence and optimistics,he finally succeeded.
The other such as Nelson Mandela ,Wreight brother.