The Six Inner Qi originates from the resonances within one's own Inner Five Elements Heaven and Earth. It's not necessary to understand the Six External Qi, Heaven and Earth Qi, Mist Qi, Dawn Qi, or Dusk Qi.
Self Sect's Minister of Agriculture must cultivate the Yin Yang Self Scripture.
Anyone who begins cultivating the Yin Yang Self Scripture will generally reach the Second Layer Realm at the Middle Grade, able to perceive the Five Elements Qi as if it were threads and strands.
Furthermore, the Five Elements Gan Zhi is the foundational knowledge for the Minister of Agriculture, which is why the Magic Theory Zhao Xing talked about is understandable even to the Low-level Minister of Agriculture of the Lower Third Rank.
"When the Six Dominant Qi conflicts with the wind, it will change the wind and roll the grass, planting it to the west of the Earth Wind."
"When the Six Dominant Qi conflicts with the heat, it can be differentiated into the autumn transport and summer transport."