verse 28

if sravakas as well as pratyekabuddhas,
who work towards nirvana for merely themselves,
exert so much effort fulfilling their purpose
that were they in flames, they'd not stray from their goal,

then how much more energy must be expended
by those of us working for everyone's sake;
enlightenment calls for the most perseverance —
the sons of the buddhas all practice this way.