Please combine Mozi's specific words and deeds to talk about its characteristics.

Mohism is a school with leaders, doctrines and organizations, and they have strong feelings for social practice. Mohism bears hardships and stands hard work, is strict with self-discipline, and takes upholding justice and morality as its first duty. Most of the writers are knowledgeable workers. Mohism in the early period had a great influence in the early Warring States period, and it was also called a prominent school with Confucianism. Its social ethics takes universal love as the core, advocates "the two are easy to change" and opposes the social hierarchy concept emphasized by Confucianism. It puts forward "mutual love and mutual benefit" and regards Shang Xian, Shang Tong, frugality and funeral as the way to govern the country. He also opposed the annexation war at that time and put forward the idea of self-destruction. It advocates non-destiny, ambition and knowing ghosts. On the one hand, it denies the destiny, while at the same time acknowledging the existence of ghosts and gods. In the early stage, Mohism put forward a cognitive method based on experience, which advocated "seeing what you hear" and "taking the facts and naming them". Three tables are put forward as a method to test the correctness of understanding. The late Mohism merged into two branches: one focused on the study of epistemology, logic, geometry, geometrical optics, statics and other disciplines, which was called "post-Mohism" (also known as "post-Mohism"), and the other was transformed into a ranger in Qin and Han Dynasties. The former inherited the early Mohist social ethics and made great achievements in epistemology and logic. The late Mohist school not only affirmed the role of sensory experience in cognition, but also acknowledged the role of rational thinking in cognition, which overcame the empiricism tendency of the early Mohist school. It also clearly defines the basic categories of ancient logic, such as reason, reason and category, distinguishes three concepts, such as "da", "category" and "private", and studies the forms of judgment and reasoning, which occupies an important position in the history of ancient logic in China. After the Warring States period, Mohism has declined. In the Western Han Dynasty, Mohism basically disappeared after the Western Han Dynasty, due to the policy of Emperor Wu's exclusive respect for Confucianism, the change of social mentality and the hard training, strict rules and noble thoughts that Mohism itself was not accessible to everyone.