is not the potter the master of his own clay, of the same mass to make one vessel for use and ornament, and another for a meaner purpose?

Your levity is very indecent: don't you know that a little leaven infects the whole mass?

purge out the old leaven, that you may be a new mass, since you should be without leaven. for Christ our paschal lamb has been sacrificed for us.

a little leaven affects the whole mass.