He applied to 30 jobs when he was looking for work and was rejected from all of them, including a job at KFC where 24 people applied and they hired everyone but him. He wrote to Harvard for a total of 10 times and was knocked back every single time

Jack Ma, Founder of Alibaba (Billionaire ranked 23rd of richest people on earth)

To Sum up ; Persistence and Optimism are golden keys to success 😄