The essence of telepathy consists in the sympathetic induction of vibration between two or more individuals. It can be described as the art of hearing the whispers of another's mind. In order to do this, we must be quiet within our own minds.
Consciousness is not really a verbal process. In order to communicate, we must translate our consciousness into a symbolic structure. In order to receive the communication, we must translate symbols back into consciousness.
Telepathic communication is merely a subtler alteration, perceptible only when the grosser vibrations are quieted. Telepathy may result when two or more minds are rhythm-entrained such that a variation in the pattern of one rhythm results in a similar variation in the other. Entrained rhythms increase the amplitude of the wave. A wave of higher amplitude has more potency, more chance of being heard.