Ambassador's Language

I bet Paul [as highly educated as he was] did  not ask God for supernatural knowledge  to persuade people to accept the Gospel. He demonstrated the Gospel not by persuasive words, but, by the power of the Holy Spirit. 

1 Cor.4:20
1 Cor. 9:22

I bet (just my opinion) Paul prayed something like this:

Lord, I do not ask for a perfect English grammar. I ask for the language of the people You want me to reach. If You want to reach out to children, give me the language of children. If You want me to reach women, give me the language of women. If You want me to reach out to men, give me the language of men. 

- - - 

Language is different from grammar. 

If you want to be effective in your respective ministries, speak the language of the people you are engaging with. (Nah, do not swear or do dirty talk.) Just speak the universal language: L-O-V-E. The catch though, if you have not personally experience the love of God, you cannot give it to people.

By the way, the reason why some churches demonstrated the Gospel with power is that their leaders truly OBEY God.  Just to add, some fake churches got power too. How to distinguish the counterfeit from the authentic, see if the leader live out the Gospel.