Greg Bahnsen was a disciple of Cornelius Van Til, the father of Presuppositional apologetics. He’s done a lot to make Presuppositional apologetics understandable and to apply it. I highly recommend his book Always Ready: Directions For Defending The Faith by Greg L. Bahnsen and you can read my review if you click on the link.
Here’s a nine minute video clip of Bahnsen speaking on the problem of Relativism and how relativism refutes itself:
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