They train others to trust more in WHO gives the message than in the message itself. These institutions also claim to produce experts in increase. They have guaranteed formulae for gaining converts and swelling the numbers of the institution. But after all is said and done, it is still God who gives the increase. They simply have not presented the case truthfully.
Servants provide an environment in which increase can take place.
They plant what God has determined will grow. They water what the Lord has determined will increase. But the Lord produces the increase Himself. Only He can bring fruit from seed. Of course He cannot give the increase without Himself being involved in the process.