From
The teachings of Don Juan: A yaqui way of knowledge by
Carlos Castaneda.
"Anything is one of a million paths. Therefore you must always keep in mind that a path is only a path -- if you feel you must not follow it, you must not stay with it under any conditions.
To have such clarity you must lead a disciplined life. Only then will you know that any path is only a path, and there is no affront, to oneself or others, in dropping it if that is what your heart tells you to do. But your decision to keep on the path or to leave it must be free of fear or ambition. I warn you. Look at every path carefully and deliberately. Try it as many times as you think is necessary.
This question is one that only a very old man asks. My benefactor told me about it once when I was young, and my blood was too vigorous for me to understand it. Now I do understand it. I will tell you what it is: Does this path have a heart?
All paths are the same: they lead nowhere. They are paths going through the bush, or into the bush. In my own life I could say I have traversed long, long paths, but I am not anywhere. My benefactor's question has meaning now. Does this path have a heart? If it does, the path is good; if it doesn't, it is of no use. Both paths lead nowhere, but one has a heart, and the other doesn't. One makes for a joyful journey; as long as you follow it, you are one with it. The other will make you curse your life. One makes you strong -- the other weakens you."
...
"For me there is only travelling on paths that have heart, on any path that may have heart. There I travel, and the only worthwhile challenge is to traverse its full length. And there I travel, looking, looking breathlessly."