When you are called to serve, that call doesn’t come from man, but God. Obviously, all believers are called to serve, but in this chapter Paul is referring to his own ministry.
There are many who desire the recognition of leadership so much they manufacture the call. They even believe they are God-called in their own minds.
They envy others who are at ‘the front’ and will plot, plan and scheme to gain position. If God calls you you don’t need to do that. He promotes and opens doors.
Rev Stewart Bloor