“If thou wishest thy speech and utterance to take effect in the hardened hearts, be thou severed from all attachment to this world and turn unto the Kingdom of God. Enkindle the fire of the love of God in the heart with such intensity that thou mayest become a flame of fire and a luminous lamp of guidance. At that time thy speech will take effect within the hearts, through the confirmation of the Holy Spirit.”
Tablets of ‘Abdu’l-Baha, p. 194