Saying something out loud means you are using every one of your bones. You are using your diaphragm, your brain, your ears, and your lips, teeth and tongue. Try to be consciously aware of involving every fibre of your being. That makes a deep impression. It's living with everything you've got.
Articulation is objectivity.
The more senses you involve, the more of an impression it leaves on you. What you speak is an expression of who you are. Everyone needs a sounding board, a feedback system. Because then you won't, even if you could. Language is the bridge where body meets the soul.