(To this, one of my teenagers quipped, "What a good feeling to know that when I was mina'ane'ah the lulav, some ISIS terrorist somewhere started shaking in his boots." Heh-heh. Exactly.)
Combined with hakafot (marching in a circle at shul with the lulav), this has the power to subjugate our enemies to the point that they want to serve Am Yisrael.
(Therefore, I asked my male family members to please engage in some really heartfelt hakafot because I'm overwhelmed by all my responsibilities and could really use a knock on the door from a miraculously reformed Hamas terrorista wishing to help me out.)
Most religious Jews have read Derech Hashem (as have I) and are familiar with this concept, but I'd forgotten about it and enjoyed being reminded.
(Also goes to show the much-lauded importance in the frum world of reviewing the writings of our holy Sages. You get something new each time.)
It's a deceptively simple mitzvah with tremendous beneficial power.