p. 280
उत्साहयोगेन च पादमृच्छेच्छास्त्रेण पादं च ततोऽभियाति ॥
In plain words
One quarter he gains by sheer drive put to work, and one quarter from the śāstra itself — and from there he goes the rest of the way.
Close to the Sanskrit
And by the application of zeal he would reach a quarter, and a quarter by the śāstra; from that he goes forward.