**Third, The Scope of Its Meaning.** We have already established that this sutra belongs entirely to the Perfect Teaching. Yet we may ask: What exactly is the scope of this “perfection”?
The ocean of this teaching is vast and deep, encompassing everything without exception. Form and emptiness reflect each other; its virtues and functions are manifold. Speaking of its breadth, it fully includes all five teachings—and even the teachings for humans and gods—leaving nothing outside its embrace. This reveals its profound depth and vastness.
It is like rivers: rivers do not contain the ocean, but the ocean certainly contains all rivers. Although it contains all rivers, they all share the same salty taste. Thus, even a single drop from the ocean is entirely different from river water. Similarly, the first four teachings do not contain the Perfect Teaching, but the Perfect Teaching contains all four. Though it contains them, it pervades and unifies them. Therefore, even practices like the Ten Wholesome Deeds and the Five Precepts are included within the Perfect Teaching—how much more so the third and fourth teachings, not to mention the first two?
Thus, the Perfect Teaching embraces what is shared with other teachings, yet is free from their limitations.
Hence, in terms of breadth, this Perfect Teaching is called the “Infinite Vehicle”; in terms of depth, it reveals only the “One Vehicle.” The One Vehicle has two aspects:
1. The **Shared One Vehicle**—shared with the Sudden Teaching and the Complete Teaching. 2. The **Distinct One Vehicle**—unique in its perfect fusion and complete virtues.
Through the distinct, the shared is included; both are embraced within the Perfect Teaching.
Here, we will elucidate the Distinct One Vehicle through four main topics:
1. The foundational realities on which it is based. 2. How all things are gathered into ultimate truth. 3. The demonstration of non-obstruction. 4. All-pervading containment.
Each of these will be presented in ten aspects, to reveal their boundlessness.