। ॥ ३६ ॥
In plain words
Serve that teacher with devotion, stay humble, offer him your respect and service — and once he is pleased and you have his ear, ask him what you most need to know about who you really are.
Close to the Sanskrit
Having worshipped that teacher with devotion, humble, through deference and service, and having obtained him [when he is] gracious, [the seeker] should ask what is to be known concerning the Self.