Jesus came preaching and fighting the devil, and Jesus taught and authorized His disciples to do the same during His ministry,
So they went out and preached that people should repent. And they cast out many demons, and anointed with oil many who were sick, and healed them (Mark 6.12–13).
They preached, they cast out demons, and they healed people. Likewise, the church would increase its power and influence, if she preached, fought the devil, and looked after people’s needs.