你应该树立难以实现的目标。

You have to set the goals that are almost out of reach.

youdao

你应该树立难以实现的目标，如果你的目标不必花费多大力气和智慧就能达到，那就浪费了你真正的才干与潜力。

You have to set the goals that are almost out of reach. If you set a goal that is attainable without much work or thought , you are stuck with something below your true talent and potential.

youdao