It means: endure the pain that ordinary people can't stand, and you can achieve great things that ordinary people can't. The first forbearance in this sentence is a verb and the second forbearance is a noun. The second function word of this sentence is a noun, which refers to what can be done.

Those who achieve great things will endure what ordinary people can't. How many grievances do you have to endure to deserve how much success. ? In this world, if you want to achieve great things, you must endure what ordinary people can't endure and do what ordinary people can't do. In the history of China, the story of Gou Jian's toil and bravery, and the story of Han Xin's humiliation under his legs are typical examples of predecessors' humiliation and great achievements.

The process of growing up is to bear grievances and face moments that are not understood. In life, we will always meet people who don't understand, are not recognized, and even are deliberately framed by others. When many people encounter these problems, it is inevitable that they will be excessively depressed and miserable. This is human nature, because no one can really be optimistic about the grievances and pains from the outside world.

Gou Jian: The State of Yue was defeated by the State of Wu, and Gou Jian was forced to make peace and became a hostage of the State of Wu. As a prisoner, life is naturally difficult. In order to humiliate Gou Jian, Fu Cha, the king of Wu, asked him to be his own groom. He usually raised horses and fed them, and went out to pull horses.

It's a shame that the king of a country has fallen to such a state, but even so, Gou Jian endured it. After he returned to China, he made great efforts to rule the country and finally wiped out the State of Wu in one fell swoop.