In the Bible, in the allegory of the ten wise and foolish virgins, the same idea is explained. The foolish ones did not keep oil in their lamps, the wise virgins kept it. The wise ones, therefore, answered the purpose on the day which was promised and the foolish ones repented. Ten means one, zero meaning nothing: a wise soul and a foolish soul. The wise soul collected all material in order to make his light more brilliant for that day which was the day of the promise. The foolish soul wasted it, and found it absent at the time it was needed.