"Compared with the total population of the world, even though there are
millions of us, we are few in number. We must therefore see ourselves as
a tiny measure of yeast, prepared and ready to do good to the whole of
mankind, remembering the words of the Apostle: ‘a little leaven is
enough to leaven all the dough’, transforming it completely. We have to
learn to become that yeast, that leaven, and so modify and transform
the multitude."
(http://www.opusdei.org.in/sec.php?s=310)
