VovnikAndre Schwarz-BartRIVERS OF BLOOD HAVE FLOWED, columns of smoke have obscured the sky, but surviving all these dooms, the tradition has remained inviolate down to our own time. According to it, the world reposes upon thirty-six Just Men, the Lamed-Vov, indistinguishable from simple mortals; often they are unaware of their station. But if just one of them were lacking, the sufferings of mankind would poison even the souls of the newborn, and humanity would suffocate with a single cry. For the Lamed-Vov are the hearts of the world multiplied, and into them, as into one receptacle, pour all our griefs.
Thousands of popular stories take note of them. Their presence is attested to everywhere. A very old text of the Haggadah tells us that the most pitiable are the Lamed-Vov who remain unknown to themselves. For those the spectacle of the world is an unspeakable hell.
In the seventh century, Andalusian Jews venerated a rock shaped like a teardrop, which they believed to be the soul, petrified by suffering, of an 'unknown' Lamed-Vovnik. Other Lamed-Vov, like Hecuba shrieking at the death of her sons, are said to have been transformed into dogs.
When an unknown Just rises to Heaven, a Hasidic story goes, he is so frozen that God must warm him for a thousand years between His fingers before his soul can open itself to Paradise. And it is known that some remain forever inconsolable at human woe, so that God Himself cannot warm them. So from time to time the Creator, blessed be His Name, sets forward the clock of the Last Judgment by one minute.
--- from The Last of the Just