We know that we are of God, and the whole world lies under the sway of the wicked one. 1 John 5:19 NKJV
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/religion/christianity/bible-books/1-john/chapters/1-john-5/verses/1-john-5-19/1-john-5-19.md
If the human brain is exposed to one frequency in the left ear which is 10 Hertz below another audible frequency played in the right ear, rather than hearing either of the two audible frequencies, the brain chooses to “hear” the difference between them, the “beat” frequency.