Does this path have a heart? If it does the path is good. If it doesn't it is of no use.
"Look at every path closely and deliberately. Try it as many times as you think necessary. Then ask yourself and yourself alone one question. 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 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? 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, 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."
Carlos Castaneda - From The Teachings of Don Juan
A Yaqui Way of Knowledge