Similarly downstairs, people can think and invent. In the world, it is said to be: "the spirit of all things". The advanced point of human beings lies in their brains. The development of human brains is inseparable from labor. The limitations of living in trees forced them to walk on the ground and strengthen their legs. Precisely because the brain development is different from that of any animal, although it is not as strong as a lion, does not have sharp claws like an eagle, and does not run as fast as a cheetah. It is precisely because their creation made all animals subservient that humans, who have become the masters of the earth, can use animals to feed and clothe themselves. Therefore, using animals is a cruelty that is particularly cruel to any animal. At the same time, creation and utilization are also advanced manifestations of human wisdom.