When Truth Knocks

"A young widower, who loved his five year old son very much, was away on
business when bandits came who burned down the whole village and took
his son away. When the man returned, he saw the ruins and panicked. The
took the burnt corpse of an infant to be his son and cried
uncontrollably. He organised a cremation ceremony, collected the ashes
and put them in a beautiful little bag which he always kept with him.
Soon afterwards, his real son escaped from the bandits and found his way
home. He arrived at his father's new cottage at midnight and knocked at
the door. The father, still grieving asked: "Who is it?" The child
answered, it is me papa, open the door!" But in his agitated state of
mind, convinced his son was dead, the father thought that some young boy
was making fun of him. He shouted: "Go away" and continued to cry. After
some time, the child left.
Father and son never saw each other again."

After this story, the Buddha said: "Sometime, somewhere, you take
something to be the truth. If you cling to it so much, even when the
truth comes in person and knocks on your door, you will not open it."