Failure often leads to success because of the increased amount of efforts that people put in after they see failure.
Explanation:
It is often seen that people get successful in the filed in which they want to especially after they have seen failure of the efforts put in by them to get to their goal.
The failure often leads to success of the people because after some one sees failure, the intensity of the efforts to reach to the desired point increases even more and this leads them to succeed in their field. The only thing that is required is not to give up and just keep trying until they receive what they want to.