There’s form and then there’s substance. Think of a beautifully-wrapped gift box that contains garbage. Form: Good. Substance: Stinky! Or the other way: treasures wrapped in dirty clothes buried deep in a banged-up suitcase. Good stuff. Garbage in a garbage bag: No surprise here, but still stinky. It’s best when form and substance align.
Paul will offer a substantive defense. He will anchor it in God's truth and the hope of the resurrection.