Research shows that compared to reading or thinking silently (as if there’s another way to think), the act of speech is a “quite powerful mechanism for improving memory for selected information.

According to scientists, “Learning and memory benefit from active involvement. When we add an active measure or a production element to a word, that word becomes more distinct in long-term memory, and hence more memorable.”

In short, while mentally rehearsing is good, rehearsing out loud is even better.