Words are energy in motion.  They speak directly to the conscious and subconscious mind, which is where we desire the shifts to occur in order to manifest change in our world.  Energy always does better when it is reinforced through a larger supply.  Enlightenment brings with it that larger supply or a greater degree of light.  "Plugging" into that light, so to speak, by focusing our attention, listening to and absorbing the energy that comes through one who is already enlightened and has achieved mastery brings enlightenment and healing.  It in effect, will "speed" the progress of those who are less enlightened.