Path A
Path B
"correct" - path to eternal bliss or w/e
If A were the correct path, and the man was a liar, if asked if it was the correct path he would say "no"
If A were the correct path, and the man was not a liar, if asked if it was the correct path he would say "yes"
If the man were asked "are you a liar?" he would always say "no".
If the man were a liar and asked "Are you a liar?" he would say "no", thus lying about being a liar, which is a double negative, which is actually a positive, so as long as the man is asked "Are you a liar?" he will always tell the truth. Thus you can safely assume that if you ask "Is A the correct path?" he will give an honest answer, liar or not.
