After I left the classroom as a teacher, I took a job in educational publishing sales. I was used to talking with people of high academic achievement, and I liked to challenge my students, so I was inclined to speak the same way in my new sales position. After all, I was selling to educators, philanthropic executive directors and political leaders.
My first Regional Manager (a friend and fellow member) told me something that changed the way I interacted with my contacts - and influenced how I approached talks in church. He said:
Quit talking at a level that threatens your audience. Very few people like to have to concentrate to know what you are saying. Speak their language.
The same is true in church. If the congregation has to focus energy simply on understanding the words you are using, or if they don't understand those words, they will not have energy left to contemplate what you are saying - or to hear the Spirit whisper something directly to them. If you can't explain a concept to a 12-year-old, you probably don't understand it fully - and your talk will have no impact on those who hear the words but not the message.
There is a much broader application with the concept of speaking their language, as well. Often, when we interact with people of different religions or denominations, there is misunderstanding and rejection in instances where we are saying essentially or even exactly the same thing - simply because we are not speaking the same language. We often use the same words to mean different things - like "faith", "salvation", "grace", "works", etc. On the other hand, within these exact same conversations, we often use different words to mean the same things - and, due to the words we use which have different meanings "in their language", we end up assuming a difference of opinion and/or belief when none actually exists.
Even when speaking the same language, it is possible to speak different languages. It's important to take the time to learn other people's spiritual-religious languages and speak to them in those languages.