A daoist meets a buddhist in meditation and asks him what he is doing.
The buddhist says: "I am devoting to meditation in order to shed all worldly attachments and achieve nirvana."
The daoist replies: "Why the hurry?"
"He who is without sin shall throw the first stone", said the convicted murderer to the guy who once stole candy from a store.
And then someone no one had ever noticed before threw a stone at the candy thief.
The candy thief burst out in anger: "What the hell?? Who are you to claim you are without sin?!"
And the unknown man explained: "I do not claim to be without sin, but I claim to believe so, and of course my belief is not flawless, but it is the best I can rely on right now, and I am willing to make the gamble. Maybe my decision to act on it will lead to a lesson that enlightens me further."
The candy thief objected promptly: "But NO ONE is completely without sin!"
Now the murderer threw a stone at him, too, and that made him outright furious at the insolence. "Now YOU are making an outright mockery of the whole affair!"
This prompted the unknown man to throw a stone at the murderer, and the murderer didn't even flinch.
The unknown man walked away.