"[The brothers] broke the news to [Yaakov]: “Yosef is still alive, and
he rules over all the land of Egypt.” But [Yaakov’s] heart became numb,
for he could not believe them. Then when they related all the words that
Yosef had spoken to them, and when he saw the wagons that Yosef had sent
to transport him, the spirit of Yaakov was revived." (Bereshith 45:26-
Bored with his job and wanting to play a practical joke on the townsfolk,
the shepherd boy cried “Wolf!” The first two times people ran to help him
but found it was a false alarm. The third time the boy actually needed
help, for this time the wolf was real, but no one came to his aid since
they assumed his cry was just another practical joke. He had cried “Wolf!”
one time too many. Alone with no support, the boy suffered the
consequences of his earlier lies.
Many people are unaware of the fact that the story of the boy who
cried “Wolf!” is based on our Sages commentary on the verse cited above
(1). Many years earlier. Yosef’s brothers came to Yaakov with Yosef’s
bloody coat, insinuating that Yosef had been killed. Yaakov, at least on a
conscious level, accepted their words as emeth. However, since in fact
they had lied to him then, now when they told him that Yosef was alive he
did not believe them. Our Sages derive from this that the punishment of a
liar is that even when he tells the truth (like the boy who
cried “Wolf!”), he is not believed.
What is meant by the phrase, “even when he tells the truth a liar will not
be believed?” Is it not obvious that once someone has developed a
reputation as a liar, nothing he says will be believed? What new insight
we are being taught?
The Gemara is teaching us that truth has its own power, and words of truth
are generally recognizable as truth (2). Even without the aid of a lie
detector, there are subtle indications which inform us when a person is
telling the truth and when he is lying. If someone allows himself to fall
into a pattern of speaking words that are not true, the impact of the
signs of truth will be overridden by his reputation as a liar, and he will
no longer be believed.