As to those souls who are preaching the Word of God,
it behooveth them to shake the dust of every land which they have passed by off
their shoes and to be with God and without need of the rich—although their bed
is the soil, their light is the stars of the sky and their food is the herbs of
the desert—because theirs is the wealth of the Kingdom, the honor of the realm
of might and the bounty of the divine world; and they are not in want of this
world and its cares. Their throne is the mat of humility, their honor is in
suffering every lowliness in the path of the Loving Lord and their wealth is
being empty-handed from the pomps of the world and its vanities and their
provision is trusting in God and being severed from all that is on the earth
and its wealth.
(‘Abdu’l-Baha, ‘Tablets of ‘Abdu’l-Baha’, vol. 1)