It's hard to swim with clenched fists.
Learning isn't really about conveying information. That happens, sure, but the precondition is an environment to ask questions freely, risk being wrong, and updating your mental model for how things work. The student's curiosity ignites a feedback loop of progress, and facts come along for the ride.
This is a companion discussion topic for the original entry at https://betterexplained.com/articles/math-psychological-safety/