A strong belief is actually a brittle opinion. The idea isn't new, but it hasn't reached its tipping point yet, hasn't reached wide adoption, does not seem standard, still strikes people as peculiar.

If you really want demonstrably strong beliefs, here's a counterintuitive but effective trick: start imagining that everything you believe is wrong. Just imagining. Don't go crazy. Test and critique everything. And imagine that what you believe is wrong is right. Just imagining, again. Don't go crazy.

Never assume you're above considering what you're certain of to be potentially uncertain or false. Your name: couldn't it be something else? Maybe you're dreaming, and when you wake up you'll remember your actual name. (That's actually happened to me. In more than one dream, I've had a different name. And I thought about it and was sure about this other name, and didn't even think of my real name.) It's a fact that you are not quite 100% sure about your name. Close but no cigar: practical, colloquial certainty, yes, but actual, literal, total certainty? Sorry, but no.

If you can let go of the absoluteness of knowing your own name, you can do that for any fact you're sure about. It's work - but that work enriches you with beliefs that can legitimately be called strong, because the ones you keep finding in your back pocket will tend over time toward accuracy, truth, and reliability.

The brittle kind of belief is just bluster.