महासमणो सो भणिओ, जो सव्वभूयहिए ॥२२.१॥
He is called the Great Monk who is beneficial to all beings.
The chapter opens — and, with its opening verse, the whole chapter's theme is announced — by naming the Mahasramana's single defining quality: he is beneficial to all beings (savvabhuyahie — beneficial, welfare-promoting, to all living beings without exception). Not beneficial to humans while indifferent to animals. Not beneficial to those who can reciprocate while neglectful of those who cannot. Beneficial to all beings as a natural consequence of who he is and how he lives. This universal benefit is not primarily an active quality requiring conscious effort in each moment. It is a passive quality: his presence, his practice, and his very existence benefit the world simply by what they are. A monk who genuinely harms nothing — who moves through the world with complete non-violence in body, speech, and mind — benefits everything in the world simply by that non-harm. The world is better for his existence in it. This is Mahavira's portrait of the accomplished monk: a being whose existence itself is a form of service to all life.
The simple version: The Great Monk's basic quality is that his existence is good for everything around him. Simply by being what he is, he helps.