This verse is quoted by the Sayadaw:
Now without the context this passage is an exact match for (and precursor by 500 years) the three stages of the path that Atisha & Je Tsongkhapa made famous. But my query is about "all" beings in the quote - is that word in Buddhagosha's original? Because, later in this chapter, when the Sayadaw is explaining the Noblest Aspiration, "all beings" are not mentioned.“Virtue observed out of craving for glorious existences and material well-being is inferior; virtue observed for one’s own release is moderate; virtue observed to liberate all beings, which is the perfection of virtue, is superior.” (Visuddhimagga)
Here is what Ledi Sayadaw writes:
That sure sounds like a Mahayana motivation.What is meant by “the Noblest Aspiration”? It is the verbal and mental undertaking that the bodhisatta had made at some point of time aeons before taking up the perfections.
It was made in these terms:
“As a man who knows his own strength, what use is there to get to ‘the yonder shore’ (nibbāna) alone? I will attain to Supreme Knowledge and then convey men and devas to the yonder shore.”
That was the pledge that sent the ten thousand universes reeling and echoing in applause. That was the bodhisatta’s earnest wish. For he intensely aspired to Supreme Self-Enlightenment thus:
“Knowing the Truth, I will let others know it. Freeing myself from the world, I will free others. Having crossed over, I will enable others to cross.”
This fervent and most daring aspiration is called “the Noblest Aspiration.”
Later on in chapter one is this:
The detailed process of laying the foundation for the aspiration to, and the fulfilment of, Perfect Enlightenment is dealt with in the scriptures in fifteen catechisms.
What are the 15 catechisms?