p. 278
शिष्यवृत्तिक्रमेणैव विद्यामाप्नोति यः शुचिः ।
In plain words
Vidyā comes by the disciple's way of living, taken in order, step by step — by that and by nothing else — and it comes to the one who is pure.
Close to the Sanskrit
By the graded sequence of a disciple's conduct alone does he obtain knowledge, who is pure.