かねもちけんかせず
a rich man never quarrels
Also written 金持ちケンカせず
Expression
つまらんことにいらいらしないで、金持かねもち喧嘩けんかせずの精神せいしんをもったらどうだい。
Don't get upset about small things. Try to think of things like a rich person who can afford not to argue.