The Proper Lineage, the source of the Pure Land Sect refers to the Commentary on the Shastra of Attaining a Rebirth by Great Master Tan Luan. It is based on the teaching of Nagarjuna Bodhisattva, the chapter on the Easy Practice, the Shastra of Attaining a rebirth by Vasubandhu Bodhisattva. It is the fundamental teachings of the Pure Land Sect in China.
Why should I mention this Proper Lineage, the source? It is because without the source, the meaning of the teaching is impure, improper. For instance, let us take the example of a tree. If we take a branch to be the trunk, it is unable to support the tree. If we use the branches as the building materials, they are not strong enough to become the centre pillar. Instead, we should look for the main trunk. By doing so, all the branches will be there too.
So, in the learning of the Pure Land Sect, we should first look for the trunk teaching.
By Dharma Teacher Shi Jing Zong- an extract from the Dharma teaching on Commentary of the Shastra of Attaining a Rebirth.
净土宗的正脉源头，
就是昙鸾大师的《往生论注》，
它上承龙树菩萨的《易行品》、
天亲菩萨的《往生论》，
成为中国净土宗的奠基之作。
为什么要提这个正脉源头呢？因为如果失去这个源头，法义就不纯正，就不清净。就好像一棵树，把一根小树枝当作主干，它当然承担不起来；作为建筑材料，拿树枝当中柱，那当然也是不够的。一定要把它的主干找到，这样，枝节都收摄在其中了。
所以，我们对整个净土教法的理解，一定要找到它的主干。
——净宗法师
摘自《往生论注》讲记
The following are the links in English on the teachings of:
1 Nagarjna Bodhisattva-龙树菩萨的《易行品》
2Vasubandhu Bodhisattva-天亲菩萨的《往生论》
3. Great Master Tan Luan-昙鸾大师的《往生论注》
4. Great Master Dao Chuo- there are altogether 13 links.-安乐集
5 Great Master Shandao-观经四贴疏
May these merits and virtues
Be bestowed upon all living beings equally.
Together may we bring forth the Bodhi Mind,
To attain a rebirth in the Land of Serenity Bliss
愿以此功德，
平等施一切，
同发菩提心，
往生安乐国。
𝗡𝗮𝗺𝗼 𝗔𝗺𝗶𝘁𝗮𝗯𝗵𝗮 𝗕𝘂𝗱𝗱𝗵𝗮
May the lights of Amitabha Buddha shine forth to the Three thousand great thousand worlds, bestowing care and protection to all Amitabha reciters.
感恩南無阿彌陀佛
弥陀光照三千界
护佑一切念佛人
感恩南无阿弥陀佛
A comment by oridharma:
In the Lankavatara Sutra, Sakyamuni Buddha said to the Bodhisattva Great Wisdom, ‘Seven hundred years later after my entrance into Nirvana, a Bodhisattva by the Name Nagarjuna will wide teach and explain my teachings. He recites Namo Amitabha Buddha and attains a rebirth, certifying to the Blissful Ground. All the bodhisattvas seek to attain a rebirth in the Pure Land so that they can see the Buddha and listen to his teaching, what is more for us, the mundane men? Most grateful to Namo Amitabha Buddha
在楞伽经中，释迦摩尼佛告诉大慧菩萨，他入涅槃后七百年，有菩萨名曰龙树将广大解释佛经，念佛往生净土，证欢喜地。菩萨都求生净土，为乐见佛闻法，更何况我们凡夫？感恩南无阿弥陀佛
I'm ORI the Light 