If they arise to teach My Cause, they must let the breath of Him Who is the Unconstrained, stir them and must spread it abroad on the earth with high resolve, with minds that are wholly centered in Him, and with hearts that are completely detached from and independent of all things, and with souls that are sanctified from the world and its vanities. It behoveth them to choose as the best provision for their journey reliance upon God, and to clothe themselves with the love of their Lord, the Most Exalted, the All-Glorious. If they do so, their words shall influence their hearers.
- Bahá'u'lláh (‘Gleanings from the Writings of Bahá'u'láh’)