Say it in your brains

One night, Bilingu and I were saying a good night prayer. I was saying it softly, though, and Bilingu was having trouble hearing. This had been a problem in the past, and Bilingu didn't like it when I said prayers too softly. Bilingu wanted to hear, and felt annoyed. Not being too godly about the whole thing, Bilingu said:

"Just say it in your brains!"