This thesis is of 3 objectives, namely:- to study the mindfulness appearing in Tharavāda Buddhist Scriptures, to study the development of Vipassanā-Bhāvanā according to the principles of 4 Satipatthāna appearing in Theravada Buddhist Scriptures and to study mindfulness (Sati) development to be mindfulness Enlightenment-factors (Sati-Sambojjhanga) in Vipassana Meditation practice by studying the data from Theravāda Buddhist Scriptures:- the three Baskets, the Commentaries, the Sub- commentaries and other connected Scriptures and brought them to be explained in the descriptive type, and to propose them to the experts who will connect them. From the study, it is found that.

Sati is the recollection with the controlling and is of the characteristic of being near to the temperaments of the duty of not forgetting, is of the benefit in preserving the memory, the knowledge in the body, etc. It is the way carry out the mindfulness appearing in the other Dhammas such as; 5 Balas, 5 Indriyas, 7 Bojjhaṅgas and 4 Satipaṭṭhānas. All these doctrinal principles are connected with the development of the mindfulness to attain Magga, Phala and Nibbāna.

The development of Vipassanā-Bhāvanā is of 4 Satipaṭṭhānas as the important doctrinal principles which are co-operative organs which are the effort, Sampajañña and Sati which fixes the mind to know the Form and the Norm by recollecting according to the 4 bases:- the body, the feeling, the mind and the Dhamma continually with Ātāpī, Sampajāno and Satimā as the qualitative organs causes one to see the Doctrinal State appearing according to the fact which cause the Vipassanā Meditators to have the wisdom realizing the Form and the Norm, the three characteristics and the Four Nobble Truths by considering and realizing the state of Aniccaṁ, Dhukkhaṁ and Anattā. Such the Knowledge cause one to know clearly the Truth with Bodhipakkhiyadhammas to support the continually rising up of mindfulness. The development of the mindfulness means the process of rising up the clearness of mindfulness are the continuation of fixing mind to know the temperament of meditation through out the development of the Vipassana Meditation.

The development of the mindfulness cause the important characteristic of the appreaing manner of the mindfulness. That is to cause the mind to appear infront, and to know the present state, and to cause the temperaments. Sati-Sambojjhanga means the wisdom organ which is the mindfulness. Sati is an organ of Bojjhaṅgas. The mindfullness (Sati) is one of the organs of 7 Bojjhaṅgas and causes the Ñanadassana to arise. The Vipassana Meditors can see the real state at the moment of recognizing that temparaments. This fact causes the meditator to know the mental state by having Yonisomanasikāra as the basic principle of the Dhamma and as the cause and the factor to cause Kusala Dhammas to arise.

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