S&H says “Suffer no claim of sin or of sickness to grow upon the thought…” (S&H 390:20-21). The only place where anything can grow or develop is thought, for everything is thought. Since Mind is the source of all thought, we read again that “…growth is the eternal mandate of Mind” (S&H 520:26). The only thought is divine, and nothing alien to this divinity that you are can possibly emerge.