Shree Krishna said in Shree Bhagvat Gita that you become what you believe you are . If you believe you can do anything great than you do hard work and maybe you reach that level and if you dont believe that you can do it than you dont even try so you lose before even trying that is trying and losing is better than not even trying and this quote explained by shree krishna is explained in detail that if you believe that you are loser than it is not possible that you will achieve something great in life and if you think positive about yourself even in tough situation than you have gained control on your mind by avoid being negative and keep going no matter what . After losing in anything or been rejected or any heartbreak , it depends on your choice that how you react and handle your situation , if you do hard work with pure dedication it is always possible that you will get success but if you give up after losing than the chances of achieving something in life becomes zero . Conclusion : have control on your mind to handle toughest situation and always be positive about yourself always believe that you can be better and can do this