In this study, I figured out Jinul's practice principle and its way by dividing them into three topics.
These are major factors in Jinul's practice.
Such three subjects deal with different aspects each other, and simultaneously keep going on a consistent flow following the same axis.
A consistent flow points out that all the three topics, Seongyoilchi(禪敎一致, the convergence of Seon and doctrine), Jeonghyessangsu(定慧雙修, Balanced cultivation of meditation and transcendental wisdom), Donojeomsu(頓悟漸修, Sudden enlightenment and gradual cultivation) might be interpreted as the matter of language and conception.
I could figure out that the suggested subject order showed the practitioner's inside mind and its way were gradually coming on the surface and visualized.
The convergence of Seon and doctrine can be called the theory that explains which positions the theories of the doctrinal school and the Dhyana school have as the theory of buddhist practice.
It can be said that the reason why the dhyana school sticked to an enlightenment as the standard of practice is that it was only interested in the condition of enlightenment as the goal of practice.
So, the practice theory of the dhyana school is meaningful when it comes to clarification of practice direction, but it is lethargic to explain the process of practice.
On the other hand, the reason why the doctrinal school sticked to language as the process of practice was largely conscious of the distance between a goal of practice and a real practice.
In the practice theory of the doctrinal school, there showed the need of practice as it was emphasizing the gap between Buddha and sentient beings, but the confirmation of practice that I can be the Buddha, the goal of practice, is getting weaker.
In such like two theories on practice, Jinul emphasized that only focusing on the one of them showed incomplete, and also mutual supplementation in two practice theories might lead to a perfect practice theory.
"Balanced cultivation of meditation and transcendental wisdom" shows the suggestion that we literally practice Samadhi and Wisdom together.
''Balanced cultivation of meditation and transcendental wisdom'' was revealed as an active suggestion by Jinul, but in its assertion, I could find out a seperation of "定(samadhi)" and "慧(wisdom)" in buddhist practice at the time of Jinul.
However "定(samadhi)" and "慧(wisdom)" cannot be figured out as different practices in fact.
"定(samadhi)" means the goal to achieve for practice, on the other hand, "慧" shows the process to go to the final state of practice from the phenomenal world as its starting point.
In here, Jinul's suggestion is that the goal and process of practice cannot be apart.
"Sudden enlightenment and gradual cultivation" is consisted as the main part of Jinul's practice theory with "Balanced cultivation of meditation and transcendental wisdom".
Don'o(頓悟) means "to Suddenly enlighten", Jeomsu(漸修) means "to gradually cultivate".
In 'Surangama Sutra', there are the explanations for Sudden enlightenment in the point of "理", Gradual cultivation in the point of "事" .
All the practices might be called as Gradual cultivation which can be figured out in time, here, it is logically impossible to find Sudden enlightenment which is the different practice from Gradual practice.
Such like this, it can be said that Sudden enlightenment(頓悟) and gradual cultivation(漸修) might be divided conceptionally, at this time, it is possible to see that Sudden enlightenment and Gradual cultivation are not two practices, but the one practice with different aspects.
As a result, "Balanced cultivation of meditation and transcendental wisdom(定慧雙修)" and "Sudden enlightenment and gradual cultivation(頓悟漸修)" were the suggested solutions to solve the confrontation of the doctrinal school and the dhyana school on the base of buddhist thought, it can be said that the dhyana school chose "定(samadhi)" from "Balanced cultivation of meditation and transcendental wisdom(定慧雙修)", "頓悟(sudden enlightenment)" from "Sudden enlightenment and gradual cultivation(頓悟漸修)", the doctrinal school chose "慧(wisdom)" from "Balanced cultivation of meditation and transcendental wisdom(定慧雙修)", "漸修(gradual cultivation) from "Sudden enlightenment and gradual cultivation(頓悟漸修)" as their practice principles.
And also, Jinul had an interest on its right practice and tried to show the right practice progress more in detailed and explicit logic unlike other practitioners.
Jinul's theory, "What buddha said is 'doctrine', what he let people know with mind is 'Seon'. Mind and Word cannot be out of step each other." might be called the direct expression in which I could understand the practice process and the goal mentioned above as the one.