When you and the silence become friends, it will speak to you as loudly as anything you could ever hear from the outer world. Soon you will not be able to ignore its voice, which after all is the voice of your own spirit calling to you.
What can we gain by sailing to the moon if we are not able to cross the abyss that separates us from ourselves? This is the most important of all voyages of discovery, and without it all the rest are not only useless but disastrous.