You will not argue a teammate into a new belief. You can't out-deck a conviction.
Robbins gives a better picture. A belief is a table. It stands on legs — the references, the experiences, the proof a person has stacked under it over years. The table holds because the legs hold. Take a swing at the tabletop and nothing moves.
So you work the legs. To weaken an old belief, you find the references that no longer hold weight. To build a new one, you stack fresh legs under it — small, real, undeniable experiences.
On a team, that means evidence, not eloquence. A pilot beats a pitch. One small win a skeptic can touch does more than an hour of your certainty. People believe what they've seen their own hands do.
Three legs to stack this week. Run the smallest version of the new way and let the doubters watch. Put the result where they can't miss it. Then ask them to explain why it worked — the explaining is them building the table for you.
Change the proof, and the belief follows. Don't win the argument. Build the legs.