The audio is easier to understand, but he uses a whiteboard quite a bit,
so it may be useful to check the video as well.
I have to say, I found this lecture somewhat bizarre.
There are many other lectures there that look potentially quite interesting:http://podcast.shin-ibs.edu
The thousands of lines of the Prajnaparamita can be summed up in the following two sentences:
1) One should become a Bodhisattva (or, Buddha-to-be), i.e. one who is content with nothing less than all-knowledge attained through the perfection of wisdom for the sake of all beings.
2) There is no such thing as a Bodhisattva, or as all-knowledge, or as a ‘being’, or as the perfection of wisdom, or as an attainment.
To accept both these contradictory facts is to be perfect. - Conze