"After Baha'u'llah many Prophets will, no doubt, appear but they will be
under His Shadow. Although they may abrogate the laws of this Dispensation
in accordance with the needs and requirements of the age in which they
appear, they nevertheless draw their spiritual force from this mighty
Revelation. The Faith of Baha'u'llah constitutes, indeed, the stage of
maturity in the development of mankind. His appearance has released such
spiritual forces which will continue to animate, for many long years to
come, the world in its development. Whatever progress may be achieved, in
later ages, after the unification of the whole human race is achieved,
will be but improvement in the machinery of the world. For the machinery
itself has been already created by Baha'u'llah. The task of continually
improving and perfecting this machinery is one which later Prophets will
be called upon to achieve. They will thus move and work within the orbit
of the Baha'i Cycle."