The enlightened ones are in my heart.
It is said that each person has their own enlightenment, which can be intuited but is difficult to convey with words.
Each of us has different levels of insight, perception, understanding, and analytical abilities. Although these abilities can be enhanced through training, that merely raises the overall lower limit — the upper limit of talent, the margin, and the depth are truly insurmountable by human effort.
Whether it's Buddhism, Confucianism, or Daoism, in the end, one must face the trial of "enlightenment."
The initial step is learning: To learn is to know. Once you've learned enough, you can communicate. When you've communicated enough, you can then contemplate. After deep contemplation... only then can you attain enlightenment.