sometimes one pays most for the things one gets for nothing

有时候一个人为不花钱得到的东西付出的代价最高。 

you have to believe in yourself. that's the secret of success. 

你必须相信自己，这是成功的关键。 

a contented mind is the greatest blessing a man can enjoy in this world. 

知足是人生在世最大的幸事。 

if you would know the value of money, go and try to borrow some. 

要想知道钱的价值，就想办法去借钱试试。 

if you wish to succeed, you should use persistence as your good friend, experience as your reference, prudence as your brother and hope as your sentry. 

如果你希望成功，当以恒心为良友，以经验为参谋，以谨慎为兄弟，以希望为哨兵。 

sometimes one pays most for the things one gets for nothing. 

有时候一个人为不花钱得到的东西付出的代价最高。