I have never once seen a bat swim. Wild.

That's an interesting question. I would offer three thoughts: First, even if the devil can hear our vocal prayers, obviously the benefits of prayer outweigh that concern. "The devil trembles when he sees the weakest Saint on his knees." Second, while it's obvious the devil has known the purpose of someone's prayer and tried to respond in imitation of God (think of the Temple), I don't see scriptural justification that this is the norm. In fact, the quote I shared above specifically states God prevents Satan from fully exercising his power, and I suspect that includes preventing his unfettered access to our communications with God. I think God wants us to treat prayer as if it were "end-to-end encrypted." Third, note what Elder Lawrence says we should avoid-- it's the negative communications like murmuring and backbiting. Those are sinful communications and ought not be in our prayers to begin with.

When you're trying to decide whether to marry someone, ask yourself, "Is this someone I can see myself cleaning puke up with in the middle of the night?"

“Nothing is more liberating, more ennobling, or more crucial to our individual progression than is a regular, daily focus on repentance. … It is the key to happiness and peace of mind.” -President Russell M. Nelson

When we refer to the temple as the house of the Lord, we focus more purposefully on our Savior Jesus Christ. We focus on our covenants, which connect us to Him and our Heavenly Father.