He was treated badly and made to suffer. But he didn’t open his mouth. He was led away like a lamb to be killed. Sheep are silent while their wool is being cut off. In the same way, he didn’t open his mouth.
People shouted at him and made fun of him. But he didn’t do the same thing back to them. When he suffered, he didn’t say he would make them suffer. Instead, he trusted in the God who judges fairly.