The sanctified souls should ponder and meditate in their hearts regarding the methods of teaching. From the texts of the wondrous, heavenly Scriptures they should memorize phrases and passages bearing on various instances, so that in the course of their speech they may recite divine verses whenever the occasion demandeth it, inasmuch as these holy verses are the most potent elixir, the greatest and mightiest talisman. (Baha'u'llah, ‘Tablets of Baha'u'llah revealed after the Kitab-i-Aqdas’)