There is no speech or language where their voice is not heard. Psalm 19:3


But when God speaks to us, it’s usually to our heart, not to our ears. He is spirit, so He does not always have to use a mouth and vocal chord.

So this brings up the next question, in heaven, what language will we speak?  Four possibilities:

1. We will speak one divine language.
2. Our words will be supernaturally translated.
3. We will have eternity to learn other languages.
4. Our spirits will "know" what we are all saying.

If you have ever traveled to another country, you know that you can understand the hearts of people very easily (you can even pick up their language within a couple weeks). Christians speak a language of love that transcends words. It’s the unity of the Spirit that communicates to one another.