US-P15.021ab ।US-P15.021cd ॥
In plain words
The intellect is the fuel of that fire which is the Ātman. Lit by ignorance, by desire, by action, it blazes on and on — through the doorways of hearing, and every sense after it.
Close to the Sanskrit
The buddhi is the fuel of the fire that is the Ātman; kindled by ignorance, desire, and actions, this one blazes forth always through the doors, hearing and the rest.