This is a famous saying of Mencius.

Mencius this passage

Besides "slandering Shu Ren" and despising the meaning of Shu Ren, we should criticize and abandon it, which is also brilliant. He pointed out that although most people are like animals, some of them are "different from animals" (Mencius called them "good nature"); To be a good man and a gentleman, the key is to restrain the part that is the same as animal nature, and to preserve and carry forward the "humanity" of "a few hopes", which Engels said is "the difference between animal nature and human nature"; That is, the latter aspect discussed by Mr. Qian in the last paragraph, that is, human nature can "restrain and neutralize creatures with sociality (need cooperation); This is beyond animals and for "people"! Generally speaking, people call human nature good. For example, Engels compared "human nature" to "animal nature". For another example, when people condemn cruel villains, they often say that they are "inhuman" and "inhuman". In other words, they actively affirm that human nature is good.