Your boasting is not a good thing. Do you not know that a little yeast leavens the whole batch of dough? Clean out the old yeast so that you may be a new batch, as you really are unleavened. For our paschal lamb, Christ, has been sacrificed. Therefore, let us celebrate the festival, not with the old yeast, the yeast of malice and evil, but with the unleavened bread of sincerity and truth. (1Corinthians 5:6-8)

The Jewish Passover is celebrated with unleavened bread. This commemorates the urgency with which the people of Moses left Egypt in accordance with God's direction.

Not only do the faithful avoid eating yeast for the festival, but before Passover eve all yeast is removed from their homes. The old yeast is thrown out.

Just as a little yeast causes the dough to puff up, boasting, pride, and arrogance are the source of spiritual puffery.

The Passover festival reminds participants of their dependence on God, the love of God, and the need to obey God.

Just a little - just a smidgen - of pride is enough to transform our whole batch. Throw out every source of boasting other than confidence in Christ.