Tales Of Power. ©1974 by Carlos Castaneda.

The conditions of a solitary bird are five:

The first, that it flies to the highest point;

the second, that it does not suffer for company,

     not even of its own kind;

the third, that it aims its beak to the skies;

the fourth, that it does not have a definite color;

the fifth, that it sings very softly.

      - San Juan de la Cruz, Dichos de Luz y Amor.