Alchemy has a procedure, it does not specifically practice the lower dantian, or the upper dantian.
It does not mean that those who practice qigong specialize in the lower dantian, and those who practice the third eye specialize in the upper dantian.
This is another kind of blind thinking.
The purpose of alchemy is the golden elixir.
At the beginning, practice water and fire, that is, Qi.
Then enter the metal and wood, which is light.
So it’s not just Qi training or light training.
Qi is the material of light.
Light is the material of golden elixir.
Light is called a small medicine.
Jindan（golden elixir） is called a great medicine.
丹道是有程序的，並不是專門練下丹田，或者上丹田。
並不是說練氣功的專門練下丹田，練第三眼的專門練上丹田。
這又是另外一種盲目的思想。
丹道的目的是金丹。
一開始先練水和火，也就是氣。
然後進入金和木，也就是光。
所以不是只有練氣或者練光。
氣是光的材料。
光是金丹的材料。
光稱為小藥。
金丹稱為大藥。
If the entrance is not opened, there is no dantian, so for a person who only has qi, he has no dantian. The qi in the lower abdomen cannot be called the lower dantian. Qi flows around the whole body, not just the lower abdomen. Focusing on the lower abs is not the right way to do it, either. The attention should follow the breath, and the breath is not always in the lower abdomen, sometimes the breath will run around, and the top of the head will also produce breath.
如果玄關沒有打開的話，是沒有丹田的，因此對一個只有氣的人來說，他是沒有丹田的。不能把下腹部的氣稱為下丹田。氣是在全身周流的，而不是只有下腹部才有氣。把注意力放在下腹部，也不是正確的練法。注意力應該是跟著呼吸，呼吸也不一定都是在下腹部，有時候呼吸也會跑來跑去，頭頂也會產生呼吸。
When the feeling of qi is concentrated in the lower abdomen, there is a pulsating feeling like a heartbeat, which is because the qi is blocked.
當氣感集中在下腹部，產生了如同心跳一樣的脈動感，這是因爲氣堵住了。
When the mind is released, the qi trapped in the lower abdomen will be transformed into light, the thoughts will disappear, and you can enter the second Dyana without special concentration.
當心念鬆開之後，這個堵在下腹部的氣，就會轉化為光，念頭就會消失，不需要特別的專心，就能進入第二個禪定。
Similarly, sometimes there will be qi in the chest that resembles the pulse of the heart. This is because the lower dantian is opened and the middle dantian is blocked.
At this time, you also need to relax your mind, and the qi trapped in the chest will be transformed into a deeper concentration. At this time, you can enter the third Dyana without special concentration.
同樣的，有時候也會出現胸部出現如同心臟脈搏的氣，這是因為下丹田打開了，中丹田塞住了。
這時候同樣也是要鬆開心念，這個堵在胸部的氣，就會轉化為更深的入定，這時候不需要特別的專心，就能進入第三個禪定。