When a person stands in judgment, he is careful with every word he speaks, lest it be used against him.  He knows that a single slip of the tongue may bring a guilty verdict upon him.

Our Sages tell us that even the light conversation between husband and wife are brought before them in their hour of judgment (Chagigah 5b).  We will be forced to give an accounting for every word we have spoken throughout our lives.  ~ Zechor L’Miriam