A letter written to Her Excellency Princess Sungnyeong
If you want to want to accomplish the one great thing, it makes no difference whether you reside amongst the ordained or not, among men or women, beginning or senior students. Everything lies within your final sincere singular thought. What I see that is different in the princess's innate disposition compared to others is that from the beginning, there has never been selfishness or suspicion or a deluded mind, there has been nothing other than an entirely sincere mind searching for the complete and unsurpassed supreme enlightenment of Buddhahood. Isn't it as if you've been permeated with the correct dharma of wisdom through a close association with Seon knowledge from some countless eons ago in the past? As the ancients say, ¡°A grown man is not someone who pays attention to a woman's figure, a grown man is someone who is endowed with the four dharmas.¡± These four dharmas are: one, an acquaintance with the knowledge of Seon; two, hearing the correct teachings; three, thinking about the meaning of those teachings; and four, acting in accordance with those teachings. If you are imbued with these four dharmas, it can truly be said that you are fully grown, if not, though you may have the body of an adult, it cannot be said that you are fully grown.
I pray, my princess, that you believe this teaching beyond a shadow of a doubt and that you ceaselessly focus on your hwadu everyday, twenty four hours a day, in all four of the bodies postures, whether walking, standing, sitting or lying down. If you concentrate without stopping, never resting, and question your hwadu whether in the midst of tranquility or noisiness, even if you are not trying to concentrate, you will naturally concentrate. When speaking or being silent, even if you are not questioning your hwadu, you naturally question. Awake or asleep, your hwadu appears before you and though you may want to forget it, you do not; though you may want to awake from it, you will not awaken. In this mental state, unwittingly the body is overturned and abandoned. It is here where a woman's body changes into a man's, a man's body changes and becomes a Buddha. This is my most ardent and sincere request of you.