The traits have been selected according to a unique approach. Each trait acts like a part of the body. That is, each trait functions like a part of the body. Responsiveness acts like the nerves which respond. Sensitivity acts like the senses which sense.
Rather than explain each trait here in this part of the FAQ, the point to share here is simply that traits are chosen because they serve a purpose - a valuable purpose, much as their correlative body part serves a purpose. Think about this: what if traits - behavioral traits - are every bit as important as body parts! For what? For wholeness. And alignment! And harmonizing! The overall picture we get is that there is a "content of our character" for harmonizing!