Today you die. No one pronounces that horrible sentence on Yom Kippur, but it is true. Yom Kippur reenacts death. We wear white, like the shrouds we will one day be buried in. We do not eat, wash, procreate; we are as corpses. We recite the "Unetaneh Tokef," filled with graphic, even gruesome images about our death.
When we arrive in heaven, the Talmudic sages wondered, what will God ask of us?