Checking the quote CowTao posted I find the following:
“The word Prajnaparamita comes through in its Sanskrit form. This means “Perfection of insight”, the highest, clearest, most straightforward or most important insight. This word insight does not just refer to an intellectual insight like the solving of a mathematical equation. ...


Dogen said: “To study the way is to study the self. To study the self is to forget the self.”