Dov Shurin explained this on country Yossi regarding sukkos.
4 body parts:
Lulav: The spine
Esrog: The heart
Hadassim: The eyes
Aravos: The Lips
Even Maasu Habonim
Arba Minim – 4 Types of Jews
Lulav: A Jew with Torah but no Mitzvos
Esrog: A Jew with Torah and Mitzvos
Hadassim: A Jew with Mitzvos but no Torah
Aravos: A Jew with no Torah or Mitzvos
We hold them together, don’t divide.
The Arba minim counted is really 7 plants – Lulav (1), Esrog (1), Hadassim (3), Aravos (2), corresponds to the 7 Ushpizim. Yosef is the Lulav, David the Esrog.
Interestingly, we hold 2 Aravos as Aravos represents a Jew with no Torah or Mitzvos. The number 2 represents incompletion (the 2nd day of creation wasn’t called Tov, partially because Hell was created then, partially because we are still completing Day 2. Also, look for a geometric shape with 2 points – doesn’t exist). Therefore, a Jew with no Torah or Mitzvos hasn’t completed his/her mission in this world, and needs to become a better person through Torah and Mitzvos.
Esrog has to be Shaleim:
- Emunah Shleimah
- Teshuva Shleimah
- Refuah Shleimah
- Geulah Shleimah