Boxer was very strong . He worked longer then any animal. He carried the stones by himself. Boxer was also hard working . He would get up extra early and did his work and sometimes others. He always said "I will work harder" and "Napoleon is always right". Boxer always pushed himself to do better and whats best for the farm.
The power/abuse of language
Squealer convinces the animals that Napoleon was always right. For example Squealer told the animals that 7 commandments were not changed. He also would tell the animals that everything Napoleon would do was alright.