A few quotes from Carlos Castenda:
http://www.knowprose.com/node/11924
"Anything is one of a million paths. Therefore, a warrior must always keep in mind that a path is only a path; if he feels that he should not follow it, he must not stay with it under any conditions. His decision to keep on that path or to leave it must be free of fear or ambition. He must look at every path closely and deliberately. There is a question that a warrior has to ask: 'Does this path have a heart?'
and
"Look at every path closely and deliberately, then ask ourselves this crucial question: Does this path have a heart? If it does, then the path is good. If it doesn't, it is of no use."