However, Yogis had worked with sound before any such researches were thought of or undertaken. The school of mantrayoga is concerned with this science. The one belief that started this was that vibration is creative and that the whole universe was produced by sound, by the word; as it is said in the Bible, first was sound and then was light. Herein lies the thought of the mystics that one may understand vibrations in two directions: when audible they become intelligible, and when taking form they become visible. Even if the word were neither audible nor visible it would have the capacity of being both. If our power of sight and hearing is not enough to help us, it is because the reality is beyond and beneath the range of our sight and hearing, and therefore it is not intelligible to us. We are not aware of it, but if our sight and hearing allowed us to hear and see it, we should know that all life is vibration.