死的緣故。the phrase sound doctrine, in which sound is hygiainos, “health-giving.”英文中“衛生的”Hygeia, ancient Greek goddess of health (from Latin Hygea, from Greek Hygieia, from hygieia health, from hygiēs sound, healthy)就是從這個譯作“純正的”和“健全的”hygiainos來的，這也是為什麼sound doctrine是讓人成聖的真理，而珍珠則是污穢的言語。這也是為什麼“污穢的言語”有些英文版本譯作unwholesome（不衛生的）word的緣故