" The Listening Exercise

Relax. Close your eyes. Try for several minutes to concentrate on all of the sounds you hear in your surroundings, as if you were hearing an orchestra playing its instruments. Little by little, try to separate each sound from
the others. Concentrate on each one, as if it were the only instrument playing. Try to eliminate the other sounds from your awareness.

When you do this exercise every day, you will begin to hear voices. First, you will think that they are imaginary. Later, you will discover that they are
voices of people from your past, present, and future, all of them participating with you in the remembrance of time.

This exercise should be performed only when you already know the voice of your messenger.

Do this exercise for ten minutes at a time. "

― Paulo Coelho , The Pilgrimage