Improperly gained wealth is often unsustainable in the long run.
通过不正当手段获得的财富往往难以长久维持。
句子中的被动表达“improperly gained wealth”增强了书面语正式感。
"Whether right or wrong, you need a principle."
"If your reasons are justified, do not fear refusing others."
"I never agree with using unscrupulous means to achieve success."
"If you can lay your finger on the particular group of principles, you can equal his achievements."
"Never wish to be a person who offends no one."