Ariel Sacks says teachers need to be mindful of how much class time they take up with the sound of their own voice:
The teacher's voice is an important piece of the teaching puzzle, but it's not the key to student learning. When the balance tips too much in the direction of the teacher's voice, it can actually hinder student learning, by diminishing space for students to think, comprehend, solve problems, collaborate with one another, and find words to express their thoughts.
Avoiding the loquaciousness trap, she explains, takes practice and monitoring.