“He must never seek to exalt himself above any one, must wash away from the tablet of his heart every trace of pride and vainglory, must cling unto patience and resignation, observe silence, and refrain from idle talk. For the tongue is a smouldering fire, and excess of speech a deadly poison. Material fire consumeth the body, whereas the fire of the tongue devoureth both heart and soul. The force of the former lasteth but for a time, whilst the effects of the latter endure a century.”
-Bahá’u’lláh, The Kitáb-i-Íqán, p. 193