This is the story which I heard somewhere. I don't know who has written it but it's interesting for sure.

This story is about three monkeys. Once, as they were roaming, they saw a mountain. Two of those monkeys talked to each other and decided that they would climb that mountain. One monkey tried. Half way through, he became very tired and came down. He told his friends that it was impossible to climb the mountain. The other monkey also tried, but came back unsuccessful. He too said that it was impossible to climb that mountain. The third monkey who saw the two friends climb the mountain and return half way, tried. He went up slowly. He reached the first bend, then the second, then the third. He put in great effort. All the while, his eyes were set on the mountain summit. Ultimately, he reached there.  After a while, he slowly got down while his two friends waited. Why do you think the first and the second monkeys could not climb the mountain but the third one could? The third monkey was deaf. He couldn't hear the negative comments that his friends had stated. He started with the grit and determination that the other two were lacking.

Don't we face similar situations in our life? So many times, we have not attempted to do something because many people have told us that it's not possible to do it. We do not question their wisdom. We are scared of failures. We find certain mountains insurmountable. But do we ever try to climb them? Life gives us chances. It depends on how well we use them. Take one step at a time. Do not let negative thoughts creep in your mind. Then your path would surely lead you to success.