'Lump' in the Bible

Does the potter not have the right over the clay, to make from the same lump [of clay] one object for honorable use [something beautiful or distinctive] and another for common use [something ordinary or menial]?

Your boasting [over the supposed spirituality of your church] is not good [indeed, it is vulgar and inappropriate]. Do you not know that [just] a little leaven ferments the whole batch [of dough, just as a little sin corrupts a person or an entire church]?

A little leaven [a slight inclination to error, or a few false teachers] leavens the whole batch [it perverts the concept of faith and misleads the church].