All Buddhas say the cause for the completion
Of the collections, whose nature is
Merit and exalted wisdom,
Is the development of higher perception.
The Sanskrit term which is translated here as higher perception is abhijna. The closest term in English is psychic powers. We're talking about reading minds, seeing things at a distance, being able to see invisible beings, and so on. Without these powers, one's ability to help others is limited. One can guide a student better when one can see what's going on in their mind. And most of the six classes of beings are invisible to us, we can't help them if we don't have psychic powers.