http://revach.net/article.php?id=2108

Section: Parshas HaShavua   Category: Quick Vort
Parshas Metzora:

 "Then shall the Kohen command to take for the person to be cleansed two living clean birds, and cedar-wood and red wool, and hyssop."

Why does the Metzora specifically take these items? Rashi explains, since he spoke Lashon HaRa and was high and haughty like a cedar tree, he must lower himself like a worm (Tolaas) and a hyssop (Aizov). Maskil L'David asks, why is it necessary for him to use 2 symbolic items to bring him to humility - the Tolaas Shani and the Aizov - wouldn't it have driven home the point with one?

 Maskil L'David explains, although by other character traits, we say that a person should take the middle of the road, not going to an extreme on either end of the spectrum, however concerning Gaavah Chazal tell us "Miod Miod Havay Shfal Ruach" - one should be exceedingly humble. It is for that reason that 2 signs of humbleness were used - to stress that the Metzora should be exceedingly humble to atone his sin.