The grass is greener on the other side of the fence.
隔岸风景好,邻家芳草绿。
If you would make an enemy,lend a man money and ask it of him again.
你若想与人结怨,只须先借钱给他,再向他催讨。
is as the proportion of the total vocabulary of his mother tongue against those words of his own baby talk that are taken up into the vernacular of his family.