"Do you know how the electric telegraph works? In St. Petersburg, for example, they start up a particular piece of equipment; in the same instant, that action in St. Petersburg is reflected in a similar piece of equipment in Moscow, and the very same motion occurs. Why does it happen like this? Because the equipment is of the same type, and because the wire connecting them is fitted to them. The action of the telegraph is like our prayer. We, along with the saints, are like two pieces of the same kind of equipment, and the medium in which the saints dwell and with which our souls are sourrounded-that is the wire."
St. Theophan the Recluse on "how the saints hear our prayers": from The Spiritual Life- And how to be Attuned to it.