Trilogy of Natural Ease
Trilogy of Finding Comfort and Ease (ngal gso skor gsum) - A trilogy of Dzogchen writings by Longchen Rabjam:
Finding Comfort and Ease in the Nature of Mind (sems nyid ngal gso)
Great Chariot (shing rta chen po), a 13 chapter auto-commentary on the above
Finding Comfort and Ease in Meditation (bsam gtan ngal gso)
Finding Comfort and Ease in the Illusoriness of Things (sgyu ma ngal gso)
The logic of their sequence
Longchenpa's commentary on the trilogy as a whole, entitled An Ocean of Fine Explanation: An Overview of the Trilogy of Comfort and Ease (ngal gso skor gsum gyi spyi don Legs bshad rgya mtsho) says:
In the beginning, when we first set out on the path, it is important that we establish a good foundation in the Dharma, and that is why the thirteen chapters of Finding Comfort and Ease in the Nature of Mind, from the difficulty of finding the freedoms and advantage onwards, offer an elaborate explanation of the Ground, the view that is beyond the two extremes. At the same time, they also explain aspects of the stages of the path and fruition.
Once we have understood the ground, we can begin to meditate on the path, and so the four chapters of Finding Comfort and Ease in Meditation offer a step-by-step explanation of the places where meditation can be practiced, the types of individual suited to the practice, the techniques we can use in meditation and the types of concentration that can be achieved.
While this path is being practiced it is important to have teachings on non-attachment and non-clinging towards phenomena. Thus, as a support, a clear and elaborate presentation of the stages of conduct is given in the eight chapters of Finding Comfort and Ease in the Illusoriness of Things. These chapters reveal, thoroughly and without any error, how to relate to all phenomena and to experience them as the eight similes of illusoriness.