A book by Carlos Castaneda. It details the teachings and practices of the old desert Yaqui sorcerers as experienced by Castaneda first hand. According to Castenada, the goal of the sorcerers is to become a man of knowledge. The process takes three steps:
1) To overcome fear to achieve clarity,
2) To overcome clarity to achieve power,
3)and to overcome power to achieve true knowledge.
The man of knowledge uses "allies", in the form of power plants and spirits, to aid his quest. The final challenge for the man of knowledge is to confront the fact of his own death, a futile battle in which he will employ all of his formidable skills in an honorable display of courage.