Hazrat Inayat Khan:

 We hear stories of saints and sages who talked with rocks and plants and trees. They are not only stories; it is reality. It is also told of the apostles that at the moment when the Spirit descended upon them they began to speak many languages. When they understood so many languages, they understood the language of every soul. It means that the illuminated soul understands the language of every soul. And every soul has its own language. It is that which is called revelation.