Before the Gurus and the Cold Plunges There Was OG Mandino and the Message Has Never Changed

Before the Gurus and the Cold Plunges There Was OG Mandino and the Message Has Never Changed

Brian Barker
Published on: 02/10/2026

I will persist until I succeed. Brian Barker on why OG Mandino's 1968 lesson still beats every modern sales guru.

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