The law of identity means that in the same thinking process, each thought is the same as itself, that is, each concept, proposition, topic, and other thinking forms are consistent, consistent, and definite. According to the definitions above, which of the following is the following that conforms to the same law? ['Some people say, "The masses are the real heroes. I am the masses. So, I am the real heroes. ".', 'Some people say: "Empiricalism cannot be opposed in general. For example, work experience, production experience should not be opposed. ".', 'Someone attacked the theory of evolution and said, "You believe that monkeys are the ancestors of humans. Then, have you changed from your grandfather or your grandmother\'s monkey group?".', 'Some people say: "The cause of justice is invincible; and our cause is the cause of justice, so our cause is invincible. ".']