“First the name of Christ sanctifies the atmosphere and drives away demons. Second, when a person is praying out loud someone else will not easily begin talking idly with him…Third, it hinders the mind from wandering which is idle talk of the mind; for even if our mind wanders the sound of your voice will bring it back quickly. Fourth, when another brother nearby who might be daydreaming are speaking idly hears you praying the prayer he might regain his composure and say to himself “My brother is praying but what am I doing?””
(Elder Ephraim of Arizona ‘My Elder Joseph” on praying out loud)ElderJoseph