In this sutta we find clear evidence that Right concentration in the eightfold path
is referring to the Four Rupa Jhanas, which is purely Buddha's innovation. An excerpt
from the sutta
“It is possible, Ānanda,” said the Blessed One. “That is a synonym for this very same noble eightfold path: ‘sublime vehicle,’ ‘Dhamma-vehicle,’ ‘unexcelled victory in battle.’”
“Right resolve… Right speech… Right action… Right livelihood… Right effort… Right mindfulness… Right concentration, when developed & pursued, has the subduing of passion as its end-point, the subduing of aversion as its end-point, the subduing of delusion as its end-point.“Right view, Ānanda, when developed & pursued, has the subduing of passion as its end-point, the subduing of aversion as its end-point, the subduing of delusion as its end-point
“It is by this sequence of reasons that one can know how that is a synonym for this very same noble eightfold path:
That is what the Blessed One said. Having said that, the One Well-Gone, the Teacher, said further:‘sublime vehicle,’ ‘Dhamma-vehicle,’ ‘unexcelled victory in battle.’”
One with the qualities
of conviction & discernment
always yoked to its shaft,
shame its pole, the heart its yoke-tie,
mindfulness the protective charioteer,
virtue the chariot-accessories,
persistence the wheels,jhāna the axle
equanimity the balance of the yoke,
hungerless-ness its upholstery,
non-ill will, harmlessness, & seclusion its weapons,
patience its armor & shield:
It rolls to security from bondage.
Coming into play
from within oneself:
the sublime vehicle unsurpassed.
They, the enlightened, leave the world.
They, absolutely, win victory.